If there's a cost associated with having it attack, its controller isn't forced to pay that cost, so it doesn't have to attack in that case either
The MTG set releases on March 8, and MTG Fallout spoilers are emerging from all over
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However, turning a face-down creature face-up doesnt cause it to leave or enter the battlefield, so it wont trigger creaturefall
Whenever another nontoken creature you control enters, put a +1/+1 counter on it