Celestial Gatekeeper Combos
Celestial Gatekeeper + Dual Nature + Phyrexian Altar
Celestial Gatekeeper + Molten Echoes + Phyrexian Altar
Combo result
Infinite colored mana. Infinite creature tokens with haste. Infinite ETB. Infinite LTB. Infinite blinking of Bird or Cleric creatures. Infinite sacrfice triggers. Infinite death triggers.
Prerequisites
Celestial Gatekeeper in hand. All other permanents on the battlefield. "Bird" or "Cleric" chosen with Motlen Echoes. {W}{W} available.