Rubblebelt Raiders {1}{R/G}{R/G}{R/G}
Creature — Human Warrior
Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control.
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Cards that do something similar expected a card that isn't here?
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Fangren Firstborn 90%
$2.46#15366
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature."
Titans' Vanguard 89%
$0.16#8020
"When you cast this spell and whenever this creature attacks, put a +1/+1 counter on each colorless creature you control."
Oran-Rief Ooze 86%
$0.26#8026
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature with a +1/+1 counter on it."
Invasion of New Capenna // Holy Frazzle-Cannon 84%
$0.21#9308
"Whenever equipped creature attacks, put a +1/+1 counter on that creature and each other creature you control that shares a creature type with it."
Shared Animosity 84%
$3.76#672
"Whenever a creature you control attacks, it gets +1/+0 until end of turn for each other attacking creature that shares a creature type with it."
Charging Hooligan 83%
$0.14#27011
"Whenever this creature attacks, it gets +1/+0 until end of turn for each attacking creature. If a Rat is attacking, this creature gains trample until end of turn."
Makeshift Battalion 82%
$0.13#22067
"Whenever this creature and at least two other creatures attack, put a +1/+1 counter on this creature."
Consul's Lieutenant 82%
$0.18#21483
"Whenever this creature attacks, if it's renowned, other attacking creatures you control get +1/+1 until end of turn."
Bounding Felidar 82%
$0.18#10971
"Whenever this creature attacks while saddled, put a +1/+1 counter on each other creature you control. You gain 1 life for each of those creatures."
Gideon, the Oathsworn 81%
#17669
"Whenever you attack with two or more non-this card creatures, put a +1/+1 counter on each of those creatures."
Knotvine Paladin 81%
$0.24#22144
"Whenever this creature attacks, it gets +1/+1 until end of turn for each untapped creature you control."
Wild Beastmaster 81%
$0.35#8287
"Whenever this creature attacks, each other creature you control gets +X/+X until end of turn, where X is this creature's power."
Sun-Blessed Guardian // Furnace-Blessed Conqueror 81%
$0.09#26825
"Whenever this creature attacks, create a tapped and attacking token that's a copy of it. Put a +1/+1 counter on that token for each +1/+1 counter on this creature. Sacrifice that token at the beginning of the next end step."
Rampaging Classmate 80%
$0.27#25040
"Whenever this creature attacks, it gets +1/+0 until end of turn for each other attacking creature."