This combo generates infinite:
- Red mana
- Cast triggers
Other variations replace Pyretic Ritual with Desperate Ritual
Steps:
- Play Isochron Scepter and exile Pyretic Ritual.
- Pay 2 mana to tap Isochron Scepter and cast the copy of Pyretic Ritual.
- When Pyretic Ritual is cast, add to your mana pool and untap Isochron Scepter with Paradox Engine.
- Repeat steps 2 and 4, netting one mana infinitely.