Fexe Vas

: At the beginning of your upkeep, reveal the top card of your library. If it's an instant, sorcery, artifact, or enchantment card, exile it.
0: Exile Fexe Vas until end of turn. You may cast a card exiled with Fexe Vas without paying its mana cost.
0: Until end of turn, Fexe becomes a 3/3 blue Rogue creature witdh unblockable that's still a planeswalker. If it dies, return it to your hand.