Herd Gnarr

Whenever another creature you control enters, this creature gets +1/+1 until end of turn.

Whenever another creature you control enters, this creature gets +3/+3 until end of turn.

Whenever another creature you control enters, that creature gets +3/+3 until end of turn.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Whenever another creature you control enters, this creature gets +1/+0 until end of turn.

Trample

Whenever another creature you control enters, this creature gets +1/+0 until end of turn.

Landfall — Whenever a land you control enters, this creature gets +2/+2 until end of turn.