Fires of Elturel

Landfall — Whenever a land enters the battlefield
under your control, exile the top card of your
library. You may play that card for as long as it remains exiled.
At the beginning of your end step, if there are
cards exiled with Fires of Elturel, put them into
their owner's graveyard, then Fires of Elturel
deals that much damage to each opponent.