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Heroes' Bane enters the battlefield with four +1/+1 counters on it.
{2}{G}{G}: Put X +1/+1 counters on Heroes' Bane, where X is its power.
If Heroes' Bane's power is less than 0 when its second ability resolves, X is considered to be 0.
The value of X is determined using the power of Heroes' Bane when the ability resolves.
