The Incredible Hulk

Trample
{x}{x}{g}{g}: Monstrosity X. (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.)
When the Incredible Hulk becomes
monstrous, creatures your opponent controls
must block The Incredible Hulk if able and their toughness becomes 0 until the end of turn.