Coalition Relic is a rare Artifact card from Modern Horizons 3 Commander (M3C), collector number 286. Current market price: $0.41, TCGplayer market prices via Scryfall.
{T}: Add one mana of any color. {T}: Put a charge counter on this artifact. At the beginning of your first main phase, remove all charge counters from this artifact. Add one mana of any color for each charge counter removed this way.