Obsidian Angel

Flying
Suspend 5 - {0} (Rather than cast this card from your hand, you may pay {0} and exile it with 5 time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost.
It has haste.)
Discard a card: Remove a time counter from Obsidian Angel. Activate this ability only if it is
in exile.