Druid

If the number of lands in play is greater than or equal to the number of players at the the start of the game times 10 then the Druid wins the game. If a player causes the druid to lose the game that player may search their library for any number of basic lands and put them into play.
When the Druid is flipped face up, Destroy all Artifacts. Each player puts a basic land into play for each permanent they controlled that was destroyed this way.
{6} {t}: return all lands in all graveyards to the battlefie