Kami of Celebration 
Creature — Spirit
$1.07 #6780 0.19 4.7 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%
$0.76↓#54690.06↓1.1 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%
$0.27↓#12676↓0.104.7 years
"Whenever a creature you control attacks alone, exile the top card of your library. You may play that card this turn."
Showdown of the Skalds78%
$0.34↓#80530.00↓5.7 years↑
"Whenever you cast a spell this turn, put a +1/+1 counter on target creature you control."
+1 more matching line
Charred Foyer // Warped Space78%
$2.51↑#2831↑0.282.1 years↓
"At the beginning of your upkeep, exile the top card of your library. You may play it this turn."
Laelia, the Blade Reforged76%
$0.34↓#1343↑0.275.5 years
"Whenever this card attacks, exile the top card of your library. You may play that card this turn."
Prosper, Tome-Bound76%
$5.12↑#2178↑0.71↑5.2 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."
Gwen Stacy // Ghost-Spider76%
$2.26↑#8401↓0.251.1 years↓
"Whenever you play a land from exile or cast a spell from exile, put a +1/+1 counter on this card."
+1 more matching line
The Thirteenth Doctor75%
$0.21↓#5155↑0.62↑3.0 years↓
"Whenever you cast a spell from anywhere other than your hand, put a +1/+1 counter on target creature."
Count on Luck75%
$0.28↓#4106↑0.111.7 years↓
"At the beginning of your upkeep, exile the top card of your library. You may play that card this turn."
Uvilda, Dean of Perfection // Nassari, Dean of Expression74%
$0.29↓#16992↓0.06↓5.5 years
"Whenever you cast a spell from exile, put a +1/+1 counter on this card."
+1 more matching line
Iron Man, Armored Avenger74%
$1.04↓#73550.47↑0.3 years↓
"Whenever you draw a card, put a +1/+1 counter on target creature."
+1 more matching line
Generous Visitor74%
$0.29↓#11401↓0.07↓4.7 years
"Whenever you cast an enchantment spell, put a +1/+1 counter on target creature."
Fire Lord Zuko74%
$0.33↓#57000.32↑0.9 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."
Boros Strike-Captain74%
$0.33↓#20165↓0.122.7 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."
Towashi Guide-Bot74%
$0.23↓#77020.06↓4.7 years
"When this creature enters, put a +1/+1 counter on target creature you control."
Lagonna-Band Trailblazer72%
$0.12↓#21221↓0.06↓12.5 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Fabled Hero72%
$0.29↓#19015↓0.00↓13.1 years↑
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on it."
Leader's Talent72%
$0.49↓#9851↓0.33↑0.6 years↓
"Whenever you cast a spell, put a +1/+1 counter on each creature you control."
Setessan Oathsworn72%
$0.16↓#23889↓0.1112.7 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."
Pheres-Band Thunderhoof72%
$0.13↓#29546↓0.07↓12.5 years↑
"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."