X-Men Vs Avengers

(Gain the next level as a sorcery to add its ability.)
When X-Men Vs Avengers enters, target creature you control deals damage equal to its power to a target creature you don't control.
{1}{g}: Level 2
Whenever you attack target attacking creature gets +1/+0 and gains trample until end of turn
{3}{g}: Level 3
At the beginning of your end step, if you control a creature with power 4 or greater, draw a card.