Blue, Loyal Raptor + Umbral Collar Zealot Combos

2 known combos featuring both cards in Commander

Infinite LTB Infinite ETB Infinite sacrifice triggers Infinite death triggers Infinite surveil

Combo 1 with Mikaeus, the Unhallowed

Also requires: Mikaeus, the Unhallowed Mikaeus, the Unhallowed
Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite surveil
Steps
  1. Activate Umbral Collar Zealot by sacrificing the other Dinosaur.
  2. When the Dinosaur dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to the -1/-1 counter it will gain from Blue.
  3. Resolve the Umbral Collar Zealot ability.
  4. Repeat.

Combo 2 with Athreos, Shroud-Veiled

Also requires: Athreos, Shroud-Veiled Athreos, Shroud-Veiled
Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite surveil
Show steps
  1. Cast the Dinosaur in your hand by paying its mana cost. It will enter with a coin counter due to Blue.
  2. Activate Umbral Collar Zealot by sacrificing the Dinosaur.
  3. When the Dinosaur dies, Athreos's second ability triggers, returning the Dinosaur from your graveyard to the battlefield. It will enter with a coin counter due to Blue.
  4. Resolve the Umbral Collar Zealot ability.
  5. Repeat from step 2.
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