Mage-Ring Network is a uncommon Land card from Ultimate Masters (UMA), collector number 246. Current market price: $0.35 (foil $0.79), TCGplayer market prices via Scryfall.
{T}: Add {C}. {1}, {T}: Put a storage counter on this land. {T}, Remove any number of storage counters from this land: Add {C} for each storage counter removed this way.