Concordant Crossroads + Umbral Collar Zealot Combos

3 known combos featuring both cards in Commander

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

Combo 1 with Jegantha, the Wellspring + Horde of Notions

Also requires: Jegantha, the Wellspring Jegantha, the Wellspring Horde of Notions Horde of Notions
Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite storm count · Infinite surveil
Steps
  1. Activate Jegantha by tapping it, adding {W}{U}{B}{R}{G} that cannot be spent to pay generic mana costs.
  2. Activate Umbral Collar Zealot by sacrificing Jegantha.
  3. Activate Horde of Notions by paying {W}{U}{B}{R}{G}, causing you to cast Jegantha from your graveyard without paying its mana cost.
  4. Repeat.

Combo 2 with Selvala, Heart of the Wilds + Slimefoot and Squee

Also requires: Selvala, Heart of the Wilds Selvala, Heart of the Wilds Slimefoot and Squee Slimefoot and Squee
Results: Infinite LTB · Infinite ETB · Infinite colored mana · Infinite sacrifice triggers · Infinite death triggers · Infinite surveil
Show steps
  1. Activate Selvala by paying {G} and tapping it, adding at least {1}{B}{R}{G}{G}.
  2. Activate Umbral Collar Zealot twice by sacrificing Selvala and Slimefoot and Squee.
  3. Activate Slimefoot and Squee by paying {1}{B}{R}{G} and sacrificing a Saproling, returning it and Selvala from your graveyard to the battlefield.
  4. When Slimefoot and Squee enters the battlefield, it triggers, creating a 1/1 Saproling creature token.
  5. Repeat.

Combo 3 with Ghired, Mirror of the Wilds + Atla Palani, Nest Tender

Also requires: Ghired, Mirror of the Wilds Ghired, Mirror of the Wilds Atla Palani, Nest Tender Atla Palani, Nest Tender
Results: Near-infinite ETB · Near-infinite LTB · Near-infinite death triggers · Near-infinite sacrifice triggers · Near-infinite surveil · Put all creature cards from your library onto the battlefield tapped
Show steps
  1. Activate Atla by paying {2} and tapping it, creating an 0/1 Egg creature token with defender.
  2. Activate Ghired by tapping a nontoken creature you control, creating a copy of the Egg token.
  3. Activate Umbral Collar Zealot by sacrificing an Egg token.
  4. When the Egg dies, Atla triggers, causing you to reveal cards from the top of your library until you reveal a creature card and put it onto the battlefield.
  5. Resolve the Umbral Collar Zealot ability.
  6. Repeat from step 2.
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