Quicksilver Fountain (Mirrodin)

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.

NM - $3.00
LP - $2.50
MP - $2.00
HP - $1.50
DMG - $1.50