Grazimith, the Mouth

Haste, Trample, Double Strike, Indestructible, Hexproof, Protection from all colors
When Grazimith enters the battlefield, it deals 10 damage to another creature you control and gets
+2/+0 until end of turn.
{b/r} {x}: Grazimith deals X damage to target
creature. Grazimith gains +1/+0 for
each creature destroyed this way.