Additive Evolution is a uncommon Enchantment card from Secrets of Strixhaven (SOS), collector number 139. Current market price: $0.20 (foil $0.25), TCGplayer market prices via Scryfall.
When this enchantment enters, create a 0/0 green and blue Fractal creature token. Put three +1/+1 counters on it. At the beginning of combat on your turn, put a +1/+1 counter on target creature you control. It gains vigilance until end of turn.