Errant Ephemeron is a common Creature — Illusion card from Duel Decks Anthology: Jace vs. Chandra (JVC), collector number 20.
Flying Suspend 4—{1}{U} (Rather than cast this card from your hand, you may pay {1}{U} and exile it with four time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost. It has haste.)