Agatha's Soul Cauldron + Bioengineered Future Combos

4 known combos featuring both cards in Commander

Infinite ETB Infinite LTB Infinite self-mill Infinite creature tokens Infinite card draw

Combo 1 with Grist, the Hunger Tide

Results: Infinite ETB · Infinite self-mill · Infinite creature tokens
Steps
  1. Activate a creature using Grist's first loyalty ability by putting a loyalty counter on it, causing you to create a 1/1 Insect creature token and mill a card, and then put a loyalty counter on the creature and repeat the process if the card was an Insect.
  2. The Insect enters the battlefield with a +1/+1 counter on it due to Bioengineered Future, causing it to have Grist's abilities.
  3. Repeat from step 1 using the Insect token instead.

Combo 2 with Inquisitive Puppet

Also requires: Inquisitive Puppet Inquisitive Puppet
Results: Infinite LTB · Infinite ETB
Show steps
  1. Activate another creature you control that has a +1/+1 counter on it by exiling it, creating a 1/1 Human creature token that enters the battlefield with a +1/+1 counter on it due to Bioengineered Future.
  2. Repeat using the Human token instead.

Combo 3 with Yidaro, Wandering Monster + Grinning Ignus

Results: Infinite card draw · Near-infinite ETB · Infinite draw triggers · Near-infinite self-discard triggers · Near-infinite LTB
Show steps
  1. Activate Yidaro's cycling ability by paying {1}{R} and discarding it.
  2. Yidaro triggers, putting it from your graveyard onto the battlefield with a +1/+1 counter on it due to Bioengineered Future.
  3. Resolve the Yidaro cycling ability, causing you to draw a card.
  4. Activate Yidaro using Grinning Ignus's ability by paying {1} and returning Yidaro from the battlefield to your hand, adding {C}{C}{R}.
  5. Repeat.

Combo 4 with Dargo, the Shipwrecker + Catalyst Elemental

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite storm count · Infinite red mana · Infinite commander casts
Show steps
  1. Cast Dargo from the command zone by paying {R}, causing it to enter the battlefield with a +1/+1 counter on it due to Bioengineered Future.
  2. Activate Dargo using Catalyst Elemental's ability by sacrificing it, adding {R}{R}
  3. Choose to return Dargo from your graveyard to the command zone.
  4. Repeat.
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