Young Destroyers

Creatures with power 1 or less can't be blocked.
When creatures with power 1 or less attack, they get +1/+0 and hexproof until end of turn.
If a creature with power 1 or less enters the battlefield this turn, it gains haste until end of turn.
At the beginning of your next end step, sacrifice Young Destroyers and each creature with power 1 or less.