Stampede

Ultimate Spell — Buff • Cost: 6

Your units get +3 ATK / +3 armor this turn. Excess combat damage they would deal to units and heroes hits that opponent's base. (This takes precedence over overpower.)

Nature stops for no man.

Green • Growth Ultimate Magic

Card-Specific Rulings

Units that have overpower do not LOSE overpower from this spell, so a Wandering Mimic would still see those units as having the keyword. It's just that Stampedes instructions for where to send the excess damage happen, and overpower's instructions don't. — Sirlin, 03/04/16