Molten Geoformer

When Molten Geoformer enters the battlefield,
return all basic land cards you own in exile to
your graveyard, then return 2 land cards from
your graveyard to your hand. If 5 or more lands
were put into your graveyard this way, put a
+1/+1 counter on Molten Geoformer.
Other creatures you control have haste as long as
you own a mountain land card in exile.