Unforgiving One
Menace (This creature can't be blocked except by two or more creatures.)
Whenever this creature attacks, return target creature card with mana value X or less from your graveyard to the battlefield, where X is the number of modified creatures you control. (Equipment, Auras you control, and counters are modifications.)
Illustrated by Fariba Khamseh
This printing
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A creature that is equipped is considered modified no matter who controls the Equipment that's attached to it.
The value of X needs to be determined both when the ability triggers (so you can choose a target) and again when the ability resolves (to check if that target is still legal). If the number of modified creatures you control has decreased enough in that time to make the target illegal, Unforgiving One's ability won't resolve.
A creature with a counter on it is considered modified no matter what kind of counter it is or which player put it on that creature.
An Aura controlled by an opponent does not cause a creature you control to be modified.
