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