Beast Mode is a common Instant card from Marvel Super Heroes Commander (MSC), collector number 713. Current market price: $0.17 (foil $0.26), TCGplayer market prices via Scryfall.
Teamwork 1 (As an additional cost to cast this spell, you may tap any number of creatures you control with total power 1 or more.) Target creature gets +2/+2 and gains trample until end of turn. Also put a +1/+1 counter on that creature if this spell was cast using teamwork.