Mirror Sheen, Desperate Ritual, and Waking Nightmare

Prerequisites

• Mirror Sheen on the battlefield
• Desperate Ritual in hand
• Waking Nightmare in hand
• available

Steps

1. Cast Waking Nightmare by paying its mana cost, targeting yourself
2. Holding priority, cast Desperate Ritual by paying its splice cost, adding its effects onto Waking Nightmare
3. Holding priority, activate Mirror Sheen by paying , copying Waking Nightmare, which also has the effects of Desperate Ritual, targeting an opponent
4. Resolve Waking Nightmare, adding
5. Repeat from step 3

Results

• Infinite magecraft triggers