You could go infinite with spell copying or just generate lots of mana on the end step and deal damage/draw cards in conjunction with Wilderness Reclamation or Ral, Storm Conduit
Like most Magic: The Gathering cards, the value of Power Play depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Conspiracy)
A 1987 Topps baseball card, in all of its wood-framed glory, would be considered cheap and undesirable today
5 Sarkhan Unbroken A powerful Dragon-themed planeswalker, Sarkhan Unbroken represents a time in Sarkhans character arc where his broken mind has been magically restored, and he is no longer under the control of any evil influences
This is great in multiplayer since you almost always have something that died thats worth reanimating on your side of the table