Mikaeus, the Lunarch is a rare Legendary Creature — Human Cleric card from Double Masters 2022 (2X2), collector number 18. Current market price: $0.81 (foil $1.80), TCGplayer market prices via Scryfall.
Mikaeus enters with X +1/+1 counters on it. {T}: Put a +1/+1 counter on Mikaeus. {T}, Remove a +1/+1 counter from Mikaeus: Put a +1/+1 counter on each other creature you control.