Araña, Heart of the Spider 
Legendary Creature — Spider Human Hero
$0.64 #5735 0.38 1.0 years
Whenever you attack, put a +1/+1 counter on target attacking creature.
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. (Equipment, Auras you control, and counters are modifications.)
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Cards similar to Araña, Heart of the Spider expected a card that isn't here?
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Kami of Celebration90%
$1.07↑#66900.05↓4.5 years↑
"Whenever a modified creature you control attacks, exile the top card of your library. You may play that card this turn."
+1 more matching line
Grotag Night-Runner89%
$0.11↓#20898↓0.00↓5.9 years↑
"Whenever this creature deals combat damage to a player, exile the top card of your library. You may play that card this turn."
Prophetic Flamespeaker89%
$0.40↓#17374↓0.14↓12.3 years↑
"Whenever this creature deals combat damage to a player, exile the top card of your library. You may play it this turn."
Lightning, Security Sergeant86%
$0.28↓#10231↓0.16↓1.2 years
"Whenever this card deals combat damage to a player, exile the top card of your library. You may play that card for as long as you control this card."
Dream Pillager83%
$0.15↓#12603↓0.12↓10.8 years↑
"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."
Armasaur Guide80%
$0.17↓#17748↓0.05↓1.8 years
"Whenever you attack with three or more creatures, put a +1/+1 counter on target creature you control."
Stromkirk Occultist80%
$0.14↓#9954↓0.58↑10.1 years↑
"Whenever this creature deals combat damage to a player, exile the top card of your library. Until end of turn, you may play that card."
Expanding Ooze80%
$0.18↓#17527↓0.18↓2.2 years↑
"Whenever this creature attacks, put a +1/+1 counter on target modified creature you control."
Moria Marauder78%
$0.50↓#53540.21↓3.2 years↑
"Whenever a Goblin or Orc you control deals combat damage to a player, exile the top card of your library. You may play that card this turn."
Surgical Suite // Hospital Room78%
$0.28↓#8436↓0.25↓1.9 years
"Whenever you attack, put a +1/+1 counter on target attacking creature."
Intet, the Dreamer78%
$0.48↓#11329↓0.24↓19.6 years↑
"Whenever this card deals combat damage to a player, you may pay 
. If you do, exile the top card of your library face down. You may look at that card for as long as it remains exiled. You may play that card without paying its mana cost for as long as this card remains on the battlefield."
. If you do, exile the top card of your library face down. You may look at that card for as long as it remains exiled. You may play that card without paying its mana cost for as long as this card remains on the battlefield."
Casey Jones, Back Alley Brute77%
$0.31↓#7643↓0.00↓0.5 years
"Whenever this card attacks, put a +1/+1 counter on target attacking creature."
Capricious Sliver77%
$0.60↓#13381↓0.69↑3.1 years↑
"Sliver creatures you control have "Whenever this creature deals combat damage to a player, exile the top card of your library. You may play that card this turn.""
Armory of Iroas76%
$0.22↓#7937↓0.22↓12.3 years↑
"Whenever equipped creature attacks, put a +1/+1 counter on it."
Bone Sabres76%
$5.73↑#59580.24↓3.9 years↑
"Whenever equipped creature attacks, put four +1/+1 counters on it."
Leader's Talent76%
$0.62↓#10284↓0.00↓0.5 years
"Whenever you attack, put a +1/+1 counter on target attacking creature."
Gleam of Battle76%
$0.16↓#13575↓0.20↓13.3 years↑
"Whenever a creature you control attacks, put a +1/+1 counter on it."
Sword of Forge and Frontier76%
$7.96↑#1878↑0.423.6 years↑
"Whenever equipped creature deals combat damage to a player, exile the top two cards of your library. You may play those cards this turn. You may play an additional land this turn."
Thundering Raiju76%
$0.51↓#4132↑0.05↓4.5 years↑
"Whenever this creature attacks, put a +1/+1 counter on target creature you control. Then this creature deals X damage to each opponent, where X is the number of modified creatures you control other than this creature."
Ranger Class74%
$0.38↓#7478↓0.17↓5.1 years↑
"Whenever you attack, put a +1/+1 counter on target attacking creature."