Iceberg + Inexorable Tide + Equilibrium + Ornithopter + Memnite

Iceberg

Inexorable Tide

Equilibrium

Ornithopter

Memnite

How it works

1. Cast Memnite by paying 0.
2. Inexorable Tide and Equilibrium trigger.
3. Resolve the Inexorable Tide trigger, putting an ice counter on Iceberg.
4. Activate Iceberg's second ability by removing an ice counter, adding C.
5. Resolve the Equilibrium trigger, causing you to pay 1 to return Ornithopter from the battlefield to your hand.
6. Cast Ornithopter by paying 0.
7. Inexorable Tide and Equilibrium trigger.
8. Resolve the Inexorable Tide trigger, putting an ice counter on Iceberg.
9. Activate Iceberg's second ability by removing an ice counter, adding C.
10. Resolve the Equilibrium trigger, causing you to pay 1 to return Memnite from the battlefield to your hand.
11. Repeat.

This clever loop turns zero-mana artifacts into an engine for endless value by leaning on cast triggers to fuel itself. Each time you cast Memnite or Ornithopter for free, Inexorable Tide rewards you by proliferating counters, which charges up Iceberg so you can cash them back in for colorless mana. That newly generated mana is then funneled directly into Equilibrium's ability, letting you bounce the other free creature back to your hand to recast it all over again.