Nicol's Prophecy

This spell can't be the target of spells or abilities
This card enters the battlefield with 20 - X time counters on it
When there are no time counters left on this enchantment, pick a number; search your library and/or graveyard for all permanents with
converted mana cost of that number and put
them on the battlefield - X's don't count. Your opponents repeat these actions one at a time counterclockwise. Then, remove all cards not on
the battlefield from the game.