Urza, Lord High Artificer, Scaretiller, Vesuva, Gods' Eye, Gate to the Reikai, and Retreat to Coralhelm

Prerequisites

• Urza, Lord High Artificer on the battlefield
• Scaretiller on the battlefield
• Vesuva in the graveyard
• Gods' Eye, Gate to the Reikai on the battlefield
• Retreat to Coralhelm on the battlefield

Steps

1. Activate Urza by tapping Scaretiller, adding
2. Scaretiller triggers, returning Vesuva from your graveyard to the battlefield as a copy of Gods' Eye
3. Put Vesuva into your graveyard due to the legend rule
4. Vesuva and Retreat to Coralhelm trigger
5. Resolve the Retreat to Coralhelm trigger, untapping Scaretiller
6. Resolve the Vesuva trigger, creating a 1/1 Spirit creature token
7. Repeat

Results

• Infinite blue mana
• Infinite creature tokens
• Infinite ETB
• Infinite landfall triggers
• Exile your library
• Cast all cards in your library without paying their mana costs