Legendary Creature — Human Warrior
Whenever Tuya Bearclaw attacks, it gets +X/+X until end of turn, where X is the greatest power among other creatures you control.
2/2
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The value of X is calculated as Tuya Bearclaw's ability resolves. If you control no other creatures at that time or if the greatest power among other creatures you control is 0 or less, X will be 0.
Once the ability resolves and the bonus is applied, that bonus won't change, even if the greatest power among other creatures you control does.