Backdraft Hellkite + Isochron Scepter + Pull from Eternity + Temporal Trespass

Mana needed: {10}{U}{U}{U}, which can be reduced by having cards in graveyard to delve away

URW identity

Commander legal

The 4 combo pieces

• Backdraft Hellkite
• Isochron Scepter
• Pull from Eternity
• Temporal Trespass

How to execute it

1. Cast the extra turn spell and move to your extra turn.
2. Activate Isochron Sceptre to cast Pull from Eternity, putting the extra turn spell from exile to your graveyard.
3. Attack with Backdraft Hellkite to give your extra turn flashback, then cast it.
4. Repeat for infinite turns.

What the combo produces

• Infinite turns
• Lock