Ruffnut & Tuffnut, The Twins

Melee (Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked this combat.)

Other creatures you control have melee. (If a creature has multiple instances of melee, each triggers separately.)

"We're a package deal! You want Ruff, you get Tuff. Look, you can't have one without the other." -Tuffnut