Zeed, Thee Extraordinarist

Haste, Firststrike
Partner with Yexil, the Mastermind
At the beginning of each player's upkeep, That
player exiles the top card from their library.
For as long as it remains in exile they may cast
that card by paying its mana cost.
Whenever a player cast a spell from exile,
you may copy that spell and choose new
targets.