Gideon, the Oathsworn {4}{W}{W}
Legendary Planeswalker — Gideon
Whenever you attack with two or more non-Gideon creatures, put a +1/+1 counter on each of those creatures.
+2: Until end of turn, Gideon becomes a 5/5 white Soldier creature that's still a planeswalker. Prevent all damage that would be dealt to him this turn. (He can't attack if he was cast this turn.)
−9: Exile Gideon and each creature your opponents control.
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Gideon, Ally of Zendikar 91%
$1.88#8981
"+1: Until end of turn, this card becomes a 5/5 Human Soldier Ally creature with indestructible that's still a planeswalker. Prevent all damage that would be dealt to him this turn."
Captain America, Skybound 88%
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"Whenever this card and at least two other creatures attack, put a +1/+1 counter on each attacking creature. They gain indestructible until end of turn."
Vrestin, Menoptra Leader 88%
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"Whenever you attack with one or more Insects, put a +1/+1 counter on each of them."
Fangren Firstborn 87%
$2.46#15366
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature."
Dyadrine, Synthesis Amalgam 86%
$0.29#9426
"Whenever you attack, you may remove a +1/+1 counter from each of two creatures you control. If you do, draw a card and create a 2/2 colorless Robot artifact creature token."
Oran-Rief Ooze 85%
$0.26#8026
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature with a +1/+1 counter on it."
Love on the Battlefield 85%
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"Whenever you attack with exactly two creatures, those creatures gain first strike until end of turn, then draw a card. Whenever either of those creatures deals combat damage to a player this combat, put a +1/+1 counter on it."
Makeshift Battalion 83%
$0.13#22067
"Whenever this creature and at least two other creatures attack, put a +1/+1 counter on this creature."
Titans' Vanguard 81%
$0.16#8020
"When you cast this spell and whenever this creature attacks, put a +1/+1 counter on each colorless creature you control."
Rubblebelt Raiders 81%
$0.13#17880
"Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control."
Orim's Prayer 80%
$0.50#17641
"Whenever one or more creatures attack you, you gain 1 life for each attacking creature."
Andúril, Narsil Reforged 80%
$16.59#2688
"Whenever equipped creature attacks, put a +1/+1 counter on each creature you control. If you have the city's blessing, put two +1/+1 counters on each creature you control instead."