Rhovanion Rampager 

Creature — Wolf
$0.28 #14462 0.11 0.2 years
Whenever this creature attacks, you may sacrifice another creature. If you do, put a number of +1/+1 counters on this creature equal to the sacrificed creature's power.
When this creature dies, amass Goblins X, where X is this creature's power. (Put X +1/+1 counters on an Army you control. It's also a Goblin. If you don't control an Army, create a 0/0 black Goblin Army creature token first.)
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Cards similar to Rhovanion Rampager expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Flesh Carver82%
$0.36↑#20502↓0.29↑12.0 years↑
"
, Sacrifice another creature: Put two +1/+1 counters on this creature."
+1 more matching line
Krenko, Tin Street Kingpin81%
$2.90↑#920↑0.41↑7.5 years↑
"Whenever this card attacks, put a +1/+1 counter on it, then create a number of 1/1 red Goblin creature tokens equal to this card's power."
High-Society Hunter79%
$0.30↑#4368↑0.101.9 years↑
"Whenever this creature attacks, you may sacrifice another creature. If you do, put a +1/+1 counter on this creature."
Syr Faren, the Hengehammer76%
$0.25↓#165300.00↓7.0 years↑
"Whenever this card attacks, another target attacking creature gets +X/+X until end of turn, where X is this card's power."
Alesha, Who Laughs at Fate75%
$1.85↑#1674↑0.34↑1.9 years↑
"Whenever this card attacks, put a +1/+1 counter on it."
Gruul Beastmaster75%
$0.09↓#24910↓0.00↓7.7 years↑
"Whenever this creature attacks, another target creature you control gets +X/+0 until end of turn, where X is this creature's power."
Gau, Feral Youth74%
$0.21↓#7936↑0.33↑1.4 years↑
"Whenever this card attacks, put a +1/+1 counter on it."
Iron-Craw Crusher74%
$0.19↓#18757↓0.063.9 years↑
"Whenever this creature attacks, target attacking creature gets +X/+0 until end of turn, where X is this creature's power."
Winter Soldier, Reborn Avenger74%
$0.31↑#123230.23↑0.3 years
"Whenever this card attacks, return target creature card with mana value less than or equal to this card's power from your graveyard to the battlefield. If a Hero enters this way, it enters with an additional +1/+1 counter on it."
Rubblebelt Rioters74%
$0.24↓#18384↓0.137.5 years↑
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the greatest power among creatures you control."
Tuya Bearclaw73%
$0.24↓#10807↑0.43↑5.9 years↑
"Whenever this card attacks, it gets +X/+X until end of turn, where X is the greatest power among other creatures you control."
Wildwood Mentor72%
$0.37↑#140100.113.1 years↑
"Whenever this creature attacks, another target attacking creature gets +X/+X until end of turn, where X is this creature's power."
Leatherhead, Iron Gator72%
$0.28#8748↑0.34↑0.6 years
"Whenever this card attacks, put two +1/+1 counters on each creature you control."
Unruly Krasis72%
$0.38↑#22363↓0.112.7 years↑
"Whenever this creature attacks, you may have the base power and toughness of another target creature you control become X/X until end of turn, where X is this creature's power."
Wild Beastmaster72%
$0.23↓#8660↑0.35↑14.0 years↑
"Whenever this creature attacks, each other creature you control gets +X/+X until end of turn, where X is this creature's power."