These are put into their owners graveyard, and any Equipment attached to the land become unattached and remain on the battlefield
Then if you control ten or more creatures, you may play the exiled card without paying its mana cost
This Phyrexian Horror is a token-doubling trigger you'll always have access to thanks to it hanging out in the Command Zone
Also, they keep any counters they have on them when they move to other zones, as long as its not your hand or your library
I have chosen persist although I somewhat consider undying and even things that just leave behind tokens when they leave play or die to all be in the same sort of group
Fortunately, that isn't all Feral Encounter does, since it has a "bite" effect." That effect is excellent in green even if the player doesn't get a creature from the library's top, assuming they have other high-power creatures already ready to bite something