Goliath Daydreamer {2}{R}{R}
Creature — Giant Wizard
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.
Whenever this creature attacks, you may cast a spell from among cards you own in exile with dream counters on them 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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Gale, Waterdeep Prodigy 87%
$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."
Smirking Spelljacker 86%
$2.79#6873
"Whenever this creature attacks, if a card is exiled with it, you may cast the exiled card without paying its mana cost."
Draconic Intervention 86%
$0.28#14995
"As an additional cost to cast this spell, exile an instant or sorcery card from your graveyard."
Dryad Militant 85%
$0.13#18485
"If an instant or sorcery card would be put into a graveyard from anywhere, exile it instead."
Boiling Rock Rioter 85%
$0.20#13348
"Whenever this creature attacks, you may cast an Ally spell from among cards you own exiled with this creature."
River Song's Diary 85%
$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."
Lilah, Undefeated Slickshot 85%
$0.28#10307
"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."
+1 more matching line
Arcane Bombardment 84%
$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."
Gandalf of the Secret Fire 84%
$2.29#14207
"Whenever you cast an instant or sorcery spell from your hand during an opponent's turn, exile that card with three time counters on it instead of putting it into your graveyard as it resolves. Then if the exiled card doesn't have suspend, it gains suspend."
Mirror-Style Master 83%
$0.27#12093
"Whenever this creature attacks, for each attacking modified creature you control, create a tapped and attacking token that's a copy of that creature. Exile those tokens at end of combat."
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."
Mardu Siegebreaker 81%
$0.46#3889
"Whenever this creature attacks, for each opponent, create a tapped token that's a copy of the exiled card attacking that opponent. At the beginning of your next end step, sacrifice those tokens."
Kess, Dissident Mage 81%
$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."
Rod of Absorption 81%
$0.49#11645
"Whenever a player casts an instant or sorcery spell, exile it instead of putting it into a graveyard as it resolves."
Robber of the Rich 81%
$1.52#10249
"Whenever this creature attacks, if defending player has more cards in hand than you, exile the top card of their library. During any turn you attacked with a Rogue, you may cast that card and you may spend mana as though it were mana of any color to cast that spell."