Master Chronomancer

Suspend 5 - {u}{u} (Rather than cast this card
from your hand, you may pay {u}{u} and exile it with
5 time counters on it. At the beginning of your upkeep,
remove a time counter. When the last one is removed,
cast it without paying its mana cost. It has haste.)
At the beginning of your upkeep put a time
counter on Master Chronomancer. If Master
Chronomnacer has 4+ time counters on it,
exile all non-land permanents with time
counters equal to its converted mana cost.