Celestial Gatekeeper | Molten Echoes | Phyrexian Altar

Cards

Cast
Celestial Gatekeeper by paying ({3} magic symbol) ({W} magic symbol) ({W} magic symbol) .
Celestial Gatekeeper enters the battlefield, triggering
Molten Echoes, creating a token copy of
Celestial Gatekeeper with haste.
Activate
Phyrexian Altar by sacrificing the nontoken
Celestial Gatekeeper, adding ({1} magic symbol) .
Celestial Gatekeeper dies, triggering itself.
In response, activate
Phyrexian Altar by sacrificing the
Celestial Gatekeeper token, adding ({1} magic symbol) .
The Celestial Gateekeeper token dies, triggering itself, exiling itself and returning
Celestial Gatekeeper from your graveyard to the battlefield.
Celestial Gatekeeper enters the battlefield, triggering
Molten Echoes, creating a token copy of
Celestial Gatekeeper with haste.
Resolve 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.
If you returned a creature of the type chosen with Motlen Echoes, it triggers, creating a token copy of that creature with haste.
Repeat from step 3.