Training Regimen is a uncommon Enchantment card from Marvel Super Heroes (MSH), collector number 192. Current market price: $0.26 (foil $0.39), TCGplayer market prices via Scryfall.
Creatures you control with +1/+1 counters on them have trample. At the beginning of combat on your turn, put a +1/+1 counter on target creature you control.