Roughshod Duo

Creature — Mouse Raccoon

Trample Whenever you expend 4, target creature you control gets +1/+1 and gains trample until end of turn. (You expend 4 as you spend your fourth total mana to cast spells during a turn.)

"En garde, inadequate excuse for a foe!" challenged the mouse. "Raaahrgh grrrr raaaargh!" agreed the raccoon.