When Endless Horizons enters, search your library for any number of Plains cards, exile them, then shuffle.
At the beginning of your upkeep, you may put a card you own exiled with Endless Horizons into your hand.
If Endless Horizons leaves the battlefield, the remaining Plains cards stay exiled. If Endless Horizons returns to the battlefield, it’s a new object with no relation to its previous existence. The previously exiled Plains cards will still stay exiled.
01-08-2008
wotc
If a different player gains control of Endless Horizons, its ability will trigger at the beginning of that player’s upkeep, but it won’t do anything when it resolves.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.