Kami of Celebration 

Creature — Spirit
$1.07 #6690 0.05 4.5 years
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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Araña, Heart of the Spider90%
$0.64↓#57350.38↑1.0 years↓
"Whenever a modified creature you control deals combat damage to a player, exile the top card of your library. You may play that card this turn."
+1 more matching line
Tempered in Solitude80%
$0.30↓#12379↓0.25↑4.5 years
"Whenever a creature you control attacks alone, exile the top card of your library. You may play that card this turn."
Charred Foyer // Warped Space78%
$2.42↑#2767↑0.24↑1.9 years↓
"At the beginning of your upkeep, exile the top card of your library. You may play it this turn."
Showdown of the Skalds78%
$0.32↓#78820.21↑5.6 years↑
"Whenever you cast a spell this turn, put a +1/+1 counter on target creature you control."
+1 more matching line
Prosper, Tome-Bound76%
$4.94↑#2184↑0.82↑5.1 years
"At the beginning of your end step, exile the top card of your library. Until the end of your next turn, you may play that card."
Count on Luck76%
$0.46↓#4287↑0.21↑1.6 years↓
"At the beginning of your upkeep, exile the top card of your library. You may play that card this turn."
Laelia, the Blade Reforged75%
$0.28↓#1316↑0.28↑5.4 years
"Whenever this card attacks, exile the top card of your library. You may play that card this turn."
Iron Man, Armored Avenger75%
$3.44↑#8332↓0.000.2 years↓
"Whenever you draw a card, put a +1/+1 counter on target creature."
+1 more matching line
The Thirteenth Doctor74%
$0.22↓#5057↑0.42↑2.9 years↓
"Whenever you cast a spell from anywhere other than your hand, put a +1/+1 counter on target creature."
Boros Strike-Captain74%
$0.36↓#19777↓0.002.5 years↓
"Whenever this creature and at least two other creatures attack, exile the top card of your library. During any turn you attacked with three or more creatures, you may play that card."
Fire Lord Zuko73%
$0.36↓#59230.000.8 years↓
"Whenever you cast a spell from exile and whenever a permanent you control enters from exile, put a +1/+1 counter on each creature you control."
Leader's Talent72%
$0.62↓#10284↓0.000.5 years↓
"Whenever you cast a spell, put a +1/+1 counter on each creature you control."
Brazen Cannonade72%
$3.30↑#10130↓0.133.8 years
"At the beginning of each of your postcombat main phases, if you attacked this turn, exile the top card of your library. Until end of combat on your next turn, you may play that card."
Nahiri, Forged in Fury72%
$8.39↑#5263↑0.46↑3.3 years↓
"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."
Towashi Guide-Bot72%
$0.23↓#75450.004.5 years
"When this creature enters, put a +1/+1 counter on target creature you control."
Generous Visitor72%
$0.26↓#11109↓0.29↑4.5 years
"Whenever you cast an enchantment spell, put a +1/+1 counter on target creature."
Uvilda, Dean of Perfection // Nassari, Dean of Expression72%
$0.28↓#16667↓0.46↑5.4 years
"Whenever you cast a spell from exile, put a +1/+1 counter on Nassari."
+1 more matching line
Pick Up the Pace72%
$0.20↓#26069↓0.000.2 years↓
"Whenever a creature you control that entered this turn attacks, exile the top card of your library."
Gwen Stacy // Ghost-Spider72%
$2.43↑#8615↓0.39↑1.0 years↓
"Whenever you play a land from exile or cast a spell from exile, put a +1/+1 counter on Ghost-Spider."
+1 more matching line