Fallen Shinobi {3}{U}{B}
Creature — Zombie Ninja
Ninjutsu {2}{U}{B} ({2}{U}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever this creature deals combat damage to a player, that player exiles the top two cards of their library. Until end of turn, you may play those cards without paying their mana costs.
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Cards that do something similar expected a card that isn't here?
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Scalpelexis 97%
$0.28#28234
"Whenever this creature deals combat damage to a player, that player exiles the top four cards of their library. If two or more of those cards have the same name, repeat this process."
Raven Guild Master 96%
$1.04#22296
"Whenever this creature deals combat damage to a player, that player exiles the top ten cards of their library."
+1 more matching line
Bismuth Mindrender 93%
$0.32#7054
"Whenever this creature deals combat damage to a player, that player exiles cards from the top of their library until they exile a nonland card. You may cast that card by paying life equal to the spell's mana value rather than paying its mana cost."
Balshan Beguiler 88%
$0.13#30058
"Whenever this creature deals combat damage to a player, that player reveals the top two cards of their library. You choose one of those cards and put it into their graveyard."
Thief of Sanity 86%
$0.51#3147
"Whenever this creature deals combat damage to a player, look at the top three cards of that player's library, exile one of them face down, then put the rest into their graveyard. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that spell."
Dream Pillager 85%
$0.18#12284
"Whenever this creature deals combat damage to a player, exile that many cards from the top of your library. Until end of turn, you may cast spells from among those exiled cards."