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Lethal damage dealt to creatures you control is determined by their power rather than their toughness.
Most of the time this is just a 7/7 Trample for 5 mana. (For example "Verdurous Gearhulk" is better stats per mana.)
Zilortha's ability is seldom relevant for other creatures unless you play a jank deck.
From what I've heard, this card only exists with the Godzilla artwork for the time being. :/