Haunted One 
Legendary Enchantment — Background
$4.86 #4783 0.11 4.4 years
Commander creatures you own have "Whenever this creature becomes tapped, it and other creatures you control that share a creature type with it each get +2/+0 and gain undying until end of turn." (When a creature with undying dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)
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Cards similar to Haunted One expected a card that isn't here?
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Undying Evil73%
$0.37↓#43750.1414.8 years↑
"Target creature gains undying until end of turn."