Kami of Celebration {4}{R}
Creature — Spirit
Whenever a modified creature you control attacks, exile the top card of your library. You may play that card this turn. (Equipment, Auras you control, and counters are modifications.)
Whenever you cast a spell from exile, put a +1/+1 counter on target creature you control.
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Tempered in Solitude 90%
$0.26#12038
"Whenever a creature you control attacks alone, exile the top card of your library. You may play that card this turn."
Connecting the Dots 89%
$0.28#9758
"Whenever a creature you control attacks, exile the top card of your library face down."
Laelia, the Blade Reforged 83%
$0.30#1297
"Whenever this card attacks, exile the top card of your library. You may play that card this turn."
+1 more matching line
Caves of Chaos Adventurer 83%
$0.44#7374
"Whenever this creature attacks, exile the top card of your library. If you've completed a dungeon, you may play that card this turn without paying its mana cost. Otherwise, you may play that card this turn."
Daredevil, Fearless Fighter 82%
$3.56#19255
"Whenever this card attacks, exile the top card of your library. this card deals damage to you equal to that card's mana value. You may play it this turn."
Synth Eradicator 82%
$0.32#8467
"Whenever this creature attacks, exile the top card of your library. You may get {E}{E} . If you don't, you may play that card this turn."
Nathan Drake, Treasure Hunter 81%
$4.72#14996
"Whenever this card attacks, exile the top card of each player's library. You may cast a spell from among those cards."
Pick Up the Pace 80%
$0.41#28430
"Whenever a creature you control that entered this turn attacks, exile the top card of your library."
Bomat Courier 80%
$0.22#12903
"Whenever this creature attacks, exile the top card of your library face down."
Nahiri, Forged in Fury 80%
$8.41#5136
"Whenever an equipped creature you control attacks, exile the top card of your library. You may play that card this turn. You may cast Equipment spells this way without paying their mana costs."
Gila Courser 80%
$0.17#15641
"Whenever this creature attacks while saddled, exile the top card of your library. Until the end of your next turn, you may play that card."