Gadreel, Chronoshifter

Equilibrium 2 - {2}{w}{u}{u} ({2}{w}{u}{u}: Exile this card with N time counters on it. At the beginning of your upkeep, remove a time counter from it. As long as there are no time counters on it, you may cast it without paying its mana cost.)
If a time counter would be removed from Gadreel, you may remove a time counter from other card you own in exile instead.
Flying, vigilance