| Card name : | Grinning Demon | Mana Cost : |   | Types : | Creature - Demon | Card Text : | At the beginning of your upkeep, you lose 2 life. Morph   (You may play this face down as a 2/2 creature for . Turn it face up any time for its morph cost.) | P/T : | 6 / 6 | Expansion : | Onslaught | Rarity : | Rare |
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| Card name : | Gustcloak Harrier | Mana Cost : |   | Types : | Creature - Bird Soldier | Card Text : | Flying Whenever Gustcloak Harrier becomes blocked, you may untap it and remove it from combat. | P/T : | 2 / 2 | Expansion : | Onslaught | Rarity : | Common |
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| Card name : | Gustcloak Runner | Mana Cost : | | Types : | Creature - Human Soldier | Card Text : | Whenever Gustcloak Runner becomes blocked, you may untap it and remove it from combat. | P/T : | 1 / 1 | Expansion : | Onslaught | Rarity : | Common |
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| Card name : | Gustcloak Savior | Mana Cost : |  | Types : | Creature - Bird Soldier | Card Text : | Flying Whenever a creature you control becomes blocked, you may untap that creature and remove it from combat. | P/T : | 3 / 4 | Expansion : | Onslaught | Rarity : | Rare |
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| Card name : | Gustcloak Sentinel | Mana Cost : |   | Types : | Creature - Human Soldier | Card Text : | Whenever Gustcloak Sentinel becomes blocked, you may untap it and remove it from combat. | P/T : | 3 / 3 | Expansion : | Onslaught | Rarity : | Uncommon |
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| Card name : | Gustcloak Skirmisher | Mana Cost : |  | Types : | Creature - Bird Soldier | Card Text : | Flying Whenever Gustcloak Skirmisher becomes blocked, you may untap it and remove it from combat. | P/T : | 2 / 3 | Expansion : | Onslaught | Rarity : | Uncommon |
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| Card name : | Harsh Mercy | Mana Cost : |  | Types : | Sorcery | Card Text : | Each player chooses a creature type. Destroy all creatures that aren't of a type chosen this way. They can't be regenerated. | | | Expansion : | Onslaught | Rarity : | Rare |
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| Card name : | Haunted Cadaver | Mana Cost : |  | Types : | Creature - Zombie | Card Text : | Whenever Haunted Cadaver deals combat damage to a player, you may sacrifice it. If you do, that player discards three cards. Morph  (You may play this face down as a 2/2 creature for . Turn it face up any time for its morph cost.) | P/T : | 2 / 2 | Expansion : | Onslaught | Rarity : | Common |
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| Card name : | Head Games | Mana Cost : |   | Types : | Sorcery | Card Text : | Target opponent puts the cards from his or her hand on top of his or her library. Search that player's library for that many cards. The player puts those cards into his or her hand, then shuffles his or her library. | | | Expansion : | Onslaught | Rarity : | Rare |
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| Card name : | Headhunter | Mana Cost : |  | Types : | Creature - Human Cleric | Card Text : | Whenever Headhunter deals combat damage to a player, that player discards a card. Morph (You may play this face down as a 2/2 creature for . Turn it face up any time for its morph cost.) | P/T : | 1 / 1 | Expansion : | Onslaught | Rarity : | Uncommon |
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| Card name : | Heedless One | Mana Cost : |  | Types : | Creature - Elf Avatar | Card Text : | Trample Heedless One's power and toughness are each equal to the number of Elves in play. | P/T : | X / X | Expansion : | Onslaught | Rarity : | Uncommon |
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| Card name : | Hystrodon | Mana Cost : |  | Types : | Creature - Beast | Card Text : | Trample Whenever Hystrodon deals combat damage to a player, you may draw a card. Morph   (You may play this face down as a 2/2 creature for . Turn it face up any time for its morph cost.) | P/T : | 3 / 4 | Expansion : | Onslaught | Rarity : | Rare |
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| Card name : | Imagecrafter | Mana Cost : | | Types : | Creature - Human Wizard | Card Text : | Choose a creature type other than Wall. Target creature becomes that type until end of turn. | P/T : | 1 / 1 | Expansion : | Onslaught | Rarity : | Common |
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| Card name : | Improvised Armor | Mana Cost : |  | Types : | Enchantment - Aura | Card Text : | Enchant creature Enchanted creature gets +2/+5. Cycling ( , Discard this card: Draw a card.) | | | Expansion : | Onslaught | Rarity : | Uncommon |
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| Card name : | Infest | Mana Cost : |   | Types : | Sorcery | Card Text : | All creatures get -2/-2 until end of turn. | | | Expansion : | Onslaught | Rarity : | Uncommon |
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| Card name : | Information Dealer | Mana Cost : |  | Types : | Creature - Human Wizard | Card Text : | Look at the top X cards of your library, where X is the number of Wizards in play, then put them back in any order. | P/T : | 1 / 1 | Expansion : | Onslaught | Rarity : | Common |
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| Card name : | Inspirit | Mana Cost : |  | Types : | Instant | Card Text : | Untap target creature. It gets +2/+4 until end of turn. | | | Expansion : | Onslaught | Rarity : | Uncommon |
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| Card name : | Insurrection | Mana Cost : |    | Types : | Sorcery | Card Text : | Untap all creatures and gain control of them until end of turn. They gain haste until end of turn. | | | Expansion : | Onslaught | Rarity : | Rare |
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| Card name : | Invigorating Boon | Mana Cost : |  | Types : | Enchantment | Card Text : | Whenever a player cycles a card, you may put a +1/+1 counter on target creature. | | | Expansion : | Onslaught | Rarity : | Uncommon |
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| Card name : | Ironfist Crusher | Mana Cost : |  | Types : | Creature - Human Soldier | Card Text : | Ironfist Crusher can block any number of creatures. Morph  (You may play this face down as a 2/2 creature for . Turn it face up any time for its morph cost.) | P/T : | 2 / 4 | Expansion : | Onslaught | Rarity : | Uncommon |
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| Card name : | Island | | | Types : | Basic Land - Island | Card Text : | | | | Expansion : | Onslaught | Rarity : | Common |
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| Card name : | Ixidor's Will | Mana Cost : |  | Types : | Instant | Card Text : | Counter target spell unless its controller pays for each Wizard in play. | | | Expansion : | Onslaught | Rarity : | Common |
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| Card name : | Ixidor, Reality Sculptor | Mana Cost : |   | Types : | Legendary Creature - Human Wizard | Card Text : | Face-down creatures get +1/+1.
 : Turn target face-down creature face up. | P/T : | 3 / 4 | Expansion : | Onslaught | Rarity : | Rare |
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| Card name : | Jareth, Leonine Titan | Mana Cost : |    | Types : | Legendary Creature - Cat Giant | Card Text : | Whenever Jareth, Leonine Titan blocks, it gets +7/+7 until end of turn.
: Jareth gains protection from the color of your choice until end of turn. | P/T : | 4 / 7 | Expansion : | Onslaught | Rarity : | Rare |
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| Card name : | Kaboom! | Mana Cost : |  | Types : | Sorcery | Card Text : | Choose any number of target players. For each of those players, reveal cards from the top of your library until you reveal a nonland card. Kaboom! deals damage equal to that card's converted mana cost to that player, then you put the revealed cards on the bottom of your library in any order. | | | Expansion : | Onslaught | Rarity : | Rare |
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