Sunstar Chaplain is a rare Creature — Human Cleric card from Edge of Eternities (EOE), collector number 40. Current market price: $0.25 (foil $0.29), TCGplayer market prices via Scryfall.
At the beginning of your end step, if you control two or more tapped creatures, put a +1/+1 counter on target creature you control. {2}, Remove a +1/+1 counter from a creature you control: Tap target artifact or creature.