Krenko, Tin Street Kingpin 

Legendary Creature — Goblin
$2.63 #894 0.42 7.3 years
Whenever Krenko attacks, put a +1/+1 counter on it, then create a number of 1/1 red Goblin creature tokens equal to Krenko's power.
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Cards similar to Krenko, Tin Street Kingpin 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.
Jacked Rabbit92%
$4.03↑#2130↓0.24↓2.1 years↓
"Whenever this creature attacks, create a number of 1/1 white Rabbit creature tokens equal to this creature's power."
Alesha, Who Laughs at Fate86%
$1.58↓#1779↓0.30↓1.8 years↓
"Whenever this card attacks, put a +1/+1 counter on it."
Syr Faren, the Hengehammer86%
$0.22↓#16218↓0.31↓6.9 years
"Whenever this card attacks, another target attacking creature gets +X/+X until end of turn, where X is this card's power."
Firebird, Blazing Ranger86%
$0.26↓#16220↓0.00↓0.2 years↓
"Whenever this card attacks, other attacking creatures get +X/+0 until end of turn, where X is this card's power."
Iron-Craw Crusher86%
$0.20↓#18343↓0.00↓3.8 years↓
"Whenever this creature attacks, target attacking creature gets +X/+0 until end of turn, where X is this creature's power."
Gau, Feral Youth85%
$0.23↓#8119↓0.22↓1.2 years↓
"Whenever this card attacks, put a +1/+1 counter on it."
Wild Beastmaster85%
$0.22↓#8469↓0.10↓13.9 years↑
"Whenever this creature attacks, each other creature you control gets +X/+X until end of turn, where X is this creature's power."
Gruul Beastmaster85%
$0.09↓#24543↓0.25↓7.6 years
"Whenever this creature attacks, another target creature you control gets +X/+0 until end of turn, where X is this creature's power."
Rubblebelt Rioters84%
$0.19↓#18106↓0.12↓7.3 years
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the greatest power among creatures you control."
Tuya Bearclaw84%
$0.26↓#10523↓0.24↓5.8 years↓
"Whenever this card attacks, it gets +X/+X until end of turn, where X is the greatest power among other creatures you control."
Rhovanion Rampager84%
$0.28↓#16745↓0.00↓0.1 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."
Wildwood Mentor84%
$0.39↓#13784↓0.04↓3.0 years↓
"Whenever this creature attacks, another target attacking creature gets +X/+X until end of turn, where X is this creature's power."
Threefold Thunderhulk84%
$0.36↓#1846↓0.16↓2.8 years↓
"Whenever this creature enters or attacks, create a number of 1/1 colorless Gnome artifact creature tokens equal to its power."
Cultivator of Blades83%
$0.30↓#9823↓0.339.9 years↑
"Whenever this creature attacks, you may have other attacking creatures get +X/+X until end of turn, where X is this creature's power."
Unruly Krasis82%
$0.41↓#21964↓0.06↓2.5 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."
Rubblebelt Raiders80%
$0.13↓#18440↓0.31↓13.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control."
Carefree Swinemaster80%
$0.13↓#23427↓0.31↓4.2 years↓
"Whenever this creature attacks, you may pay 
. If you do, create a 2/2 green Boar creature token that's tapped and attacking."
Gemini Engine80%
$0.30↓#25654↓0.5022.6 years↑
"Whenever this creature attacks, create a colorless Construct artifact creature token named Twin that's attacking. Its power is equal to this creature's power and its toughness is equal to this creature's toughness. Sacrifice the token at end of combat."
Skyknight Vanguard79%
$0.33↓#3853↓0.22↓7.2 years
"Whenever this creature attacks, create a 1/1 white Soldier creature token that's tapped and attacking."