If this creature's power is negative as its ability resolves, X is considered to be 0.
15-04-2013
wotc
You don't choose the value of X. The bonus Feral Animist gets is based on its power when the ability resolves. For example, if you activate the ability twice, the first ability will give it +2/+0 and the second one will give it +4/+0.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.