Quicksilver Fountain
Artifact
At the beginning of each player's upkeep, that player puts a flood counter on target non-Island land they control of their choice. That land is an Island for as long as it has a flood counter on it. At the beginning of each end step, if all lands on the battlefield are Islands, remove all flood counters from them.
rare · #233 · mrd
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Rank supplied by Scryfall from EDHREC; it may lag behind EDHREC. Deck counts and synergy percentages are not included.