Urza, Master of Planes

+4: Add 3 mana of any one color to your mana pool. Put two 0/2 colorless Thopter artifact creature tokens with flying named Ornithopter into play.
-4: Exile target non-land permanent. Search its controller's graveyard, hand and library for any copies and exile them. They shuffle their library.
-20: Deal X damage to target player, where X is their life total. If you control ten or more artifacts, this damage can't be prevented.