Mechtitan Core + Prototype Portal + Myr Battlesphere + Dross Scorpion + Ashnod's Altar

Prerequisites

• You control at least three other nontoken artifact creatures and/or nontoken Vehicles.

Steps

1. 1Activate Prototype Portal by paying and tapping it, creating a token copy of Mechtitan Core.
2. 2Activate the Mechtitan Core token by paying and exiling it, Myr Battlesphere, and any three other nontoken artifact creatures and/or nontoken Vehicles, creating a 10/10 Mechtitan creature token.
3. 3Activate Ashnod's Altar by sacrificing the Mechtitan token, adding .
4. 4The Mechtitan token dies, triggering Dross Scorpion and Mechtitan Core.
5. 5Resolve the Dross Scorpion trigger, untapping Prototype Portal.
6. 6Resolve the Mechtitan Core token trigger, returning all other cards exiled by it to the battlefield tapped.
7. 7Myr Battlesphere enters the battlefield, creating four 1/1 Myr artifact creature tokens.
8. 8Activate Ashnod's Altar three times by sacrificing three Myr tokens, adding .
9. 9Dross Scorpion triggers three times, allowing you to untap up to three artifacts you control.
10. 10Repeat.

Effects

• Infinite blinking of artifact creatures
• Infinite blinking of Vehicles you control
• Infinite colorless mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite creature tokens
• Infinite death triggers
• Infinite mana artifacts you control can produce
• Infinite untap of artifacts you control