Valakut Exploration

“<em>Landfall</em> — 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. <br> At the beginning of your end step, if there are cards exiled with Valakut Exploration, put them into their owner's graveyard, then Valakut Exploration deals that much damage to each opponent.”