Quicksilver Fountain 233/306 (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 - $7.50
LP - $6.00
MP - $4.50
HP - $3.00
DMG - $1.50