Combine Guildmage is a uncommon Creature — Merfolk Wizard card from Ravnica Allegiance (RNA), collector number 163. Current market price: $0.15 (foil $0.44), TCGplayer market prices via Scryfall.
{1}{G}, {T}: This turn, each creature you control enters with an additional +1/+1 counter on it. {1}{U}, {T}: Move a +1/+1 counter from target creature you control onto another target creature you control.