Arixmethes, Slumbering Isle + Ioreth of the Healing House + Saryth, the Viper's Fang

Arixmethes, Slumbering Isle
Ioreth of the Healing House
Saryth, the Viper's Fang

Requires
All permanents on the battlefield. All permanents do not have summoning sickness. Arixmethes is a creature.
Steps
  1. Activate Arixmethes by tapping it, adding gu
  2. Activate Saryth by paying 1 and tapping it, untapping Ioreth
  3. Activate Ioreth's second ability by tapping it, untapping Saryth and Arixmethes
  4. Repeat
Results
Infinite mana legendary creatures you control can produce. Infinite untap of legendary creatures you control.