Gideon's Avenger 
Creature — Human Soldier
$0.69 #14353 0.29 15.1 years
Whenever a creature an opponent controls becomes tapped, put a +1/+1 counter on this creature.
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Cards similar to Gideon's Avenger expected a card that isn't here?
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Veteran of the Depths94%
$0.18↓#24938↓0.2918.9 years↑
"Whenever this creature becomes tapped, you may put a +1/+1 counter on it."
Rhoda, Geist Avenger90%
$0.37↓#10617↑0.06↓4.8 years↓
"Whenever a creature an opponent controls becomes tapped, if it isn't being declared as an attacker, put a +1/+1 counter on this card."
Tale of Katara and Toph86%
$1.50↑#6124↑0.00↓0.8 years↓
"Creatures you control have "Whenever this creature becomes tapped for the first time during each of your turns, put a +1/+1 counter on it.""
Freyalise's Winds84%
$0.62↓#25174↓1.02↑31.3 years↑
"Whenever a permanent becomes tapped, put a wind counter on it."
Zar Ojanen, Scion of Efrava83%
$0.13↓#18215↓0.06↓4.0 years↓
"Whenever this card becomes tapped, put a +1/+1 counter on each creature you control with toughness less than the number of basic land types among lands you control."
Palliation Accord82%
$0.36↓#19407↓0.07↓20.3 years↑
"Whenever a creature an opponent controls becomes tapped, put a palliation counter on this enchantment."
Betrayal80%
$0.31↓#136430.05↓29.6 years↑
"Whenever enchanted creature becomes tapped, you draw a card."
Orcish Mine78%
$0.19↓#30376↓0.3330.9 years↑
"At the beginning of your upkeep and whenever enchanted land becomes tapped, remove an ore counter from this Aura."
Lifeblood78%
$21.47↑#30551↓0.00↓32.3 years↑
"Whenever a Mountain an opponent controls becomes tapped, you gain 1 life."
Thoughtleech78%
$0.21↓#24827↓0.3331.3 years↑
"Whenever an Island an opponent controls becomes tapped, you may gain 1 life."
Lifetap78%
$0.28↓#20961↓0.3533.1 years↑
"Whenever a Forest an opponent controls becomes tapped, you gain 1 life."
Insolence78%
$0.10↓#29186↓0.3125.6 years↑
"Whenever enchanted creature becomes tapped, this Aura deals 2 damage to that creature's controller."
Temporal Distortion78%
$0.39↓#26325↓1.09↑25.9 years↑
"Whenever a creature or land becomes tapped, put an hourglass counter on it."
Vampire Envoy77%
$0.11↓#18914↓0.3110.6 years↓
"Whenever this creature becomes tapped, you gain 1 life."
Wanderbrine Preacher77%
$0.16↓#17988↓0.00↓0.6 years↓
"Whenever this creature becomes tapped, you gain 2 life."
Solitary Sanctuary76%
$0.25↓#8424↑0.283.0 years↓
"Whenever you tap an untapped creature an opponent controls, put a +1/+1 counter on target creature you control."
Lust for War76%
$0.14↓#25817↓0.11↓16.4 years↑
"Whenever enchanted creature becomes tapped, this Aura deals 3 damage to that creature's controller."
Spirit Shackle76%
$0.24↓#29837↓0.09↓32.3 years↑
"Whenever enchanted creature becomes tapped, put a -0/-2 counter on it."
Radha, Coalition Warlord76%
$0.08↓#18693↓0.69↑4.0 years↓
"Whenever this card becomes tapped, another target creature you control gets +X/+X until end of turn, where X is the number of basic land types among lands you control."
Agent Maria Hill76%
$0.18↓#24086↓0.00↓0.2 years↓
"Whenever this card becomes tapped to pay a teamwork cost, put a +1/+1 counter on her and draw a card."