Lilah, Undefeated Slickshot {1}{U}{R}
Legendary Creature — Human Rogue
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you cast a multicolored instant or sorcery spell from your hand, exile that spell instead of putting it into your graveyard as it resolves. If you do, it becomes plotted. (You may cast it as a sorcery on a later turn without paying its mana cost.)
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Cards that do something similar expected a card that isn't here?
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River Song's Diary 87%
$0.41#5986
"Whenever a player casts an instant or sorcery spell from their hand, exile it instead of putting it into a graveyard as it resolves."
Goliath Daydreamer 85%
$0.30#10121
"Whenever you cast an instant or sorcery spell from your hand, exile that card with a dream counter on it instead of putting it into your graveyard as it resolves."
Rod of Absorption 84%
$0.49#11645
"Whenever a player casts an instant or sorcery spell, exile it instead of putting it into a graveyard as it resolves."
Dryad Militant 84%
$0.13#18485
"If an instant or sorcery card would be put into a graveyard from anywhere, exile it instead."
Draconic Intervention 83%
$0.28#14995
"As an additional cost to cast this spell, exile an instant or sorcery card from your graveyard."
Eye of the Storm 83%
$1.33#11469
"Whenever a player casts an instant or sorcery card, exile it. Then that player copies each instant or sorcery card exiled with this enchantment. For each copy, the player may cast the copy without paying its mana cost."
Kess, Dissident Mage 82%
$4.32#3076
"Once during each of your turns, you may cast an instant or sorcery spell from your graveyard. If a spell cast this way would be put into your graveyard, exile it instead."
Gale, Waterdeep Prodigy 82%
$0.48#5161
"Whenever you cast an instant or sorcery spell from your hand, you may cast up to one target card of the other type from your graveyard. If a spell cast from your graveyard this way would be put into your graveyard, exile it instead."
Arcane Bombardment 82%
$7.57#2233
"Whenever you cast your first instant or sorcery spell each turn, exile an instant or sorcery card at random from your graveyard. Then copy each card exiled with this enchantment. You may cast any number of the copies without paying their mana costs."
Suffocation 81%
$0.15#31137
"Cast this spell only if you were dealt damage this turn by a red instant or sorcery spell."
Taigam, Ojutai Master 80%
$1.00#9267
"Whenever you cast an instant or sorcery spell from your hand, if this card attacked this turn, that spell gains rebound."
Harsh Judgment 80%
$0.40#29157
"If an instant or sorcery spell of the chosen color would deal damage to you, it deals that damage to its controller instead."