Parallax Tide
{2}{U}{U}
Enchantment
Fading 5 (~this~ enters with five fade counters on it. At the beginning of your upkeep, remove a fade counter from it. If you can't, sacrifice it.)
Remove a fade counter from ~this~: Exile target land.
When ~this~ leaves the battlefield, each player returns to the battlefield all cards they own exiled with it.
Petravark
{3}{R}
Creature -- Nightmare Beast
2/2
When ~this~ enters, exile target land.
When ~this~ leaves the battlefield, return the exiled card to the battlefield under its owner's control.