Quicksilver Fountain [Mirrodin]

Description

Set:	Mirrodin
Type:	Artifact
Rarity:	Rare
Cost:	{3}

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.