Gregar, the Goblin King

Affinity for Goblins
When Gregar, the Goblin King enters the battlefield, goblin creatures you control gain trample, haste, and get +X/+0 until end of turn, where X is the number of goblin creatures you control.Sacrifice all other creatures you control
at the beginning of the next end step.
"When big boss Gregar says go, you GO!"