Celestial Gatekeeper + Molten Echoes + Phyrexian Altar

Prerequisites

• "Bird" or "Cleric" chosen with Motlen Echoes.

Steps

1. 1Cast Celestial Gatekeeper by paying .
2. 2Celestial Gatekeeper enters the battlefield, triggering Molten Echoes, creating a token copy of Celestial Gatekeeper with haste.
3. 3Activate Phyrexian Altar by sacrificing the nontoken Celestial Gatekeeper, adding .
4. 4Celestial Gatekeeper dies, triggering itself.
5. 5In response, activate Phyrexian Altar by sacrificing the Celestial Gatekeeper token, adding .
6. 6The Celestial Gateekeeper token dies, triggering itself, exiling itself and returning Celestial Gatekeeper from your graveyard to the battlefield.
7. 7Celestial Gatekeeper enters the battlefield, triggering Molten Echoes, creating a token copy of Celestial Gatekeeper with haste.
8. 8Resolve the nontoken Celestial Gateekeeper's trigger, failing to exile itself and returning up to two more Birds and/or Clerics from your graveyard to the battlefield.
9. 9If you returned a creature of the type chosen with Motlen Echoes, it triggers, creating a token copy of that creature with haste.
10. 10Repeat from step 3.

Effects

• Infinite blinking of some creatures
• Infinite colored mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite creature tokens with haste
• Infinite death triggers