Agatha's Soul Cauldron + Primal Vigor Combos

4 known combos featuring both cards in Commander

Infinite damage Infinite +1/+1 counters on a creature Infinite card draw Infinite draw triggers

Combo 1 with Anti-Venom, Horrifying Healer + Walking Ballista

Results: Infinite damage · Infinite +1/+1 counters on a creature
Steps
  1. Activate Anti-Venom using Walking Ballista's ability by removing a +1/+1 counter from it, targeting itself and putting two +1/+1 counters on it due to its replacement effect and Primal Vigor.
  2. Activate Anti-Venom using Walking Ballista's ability by removing a +1/+1 counter from it, dealing 1 damage to any target.
  3. Repeat.

Combo 2 with Anti-Venom, Horrifying Healer + Triskelion

Results: Infinite damage · Infinite +1/+1 counters on a creature
Show steps
  1. Activate Anti-Venom using Triskelion's ability by removing a +1/+1 counter from it, targeting itself and putting two +1/+1 counters on it due to its replacement effect and Primal Vigor.
  2. Activate Anti-Venom using Triskelion's ability by removing a +1/+1 counter from it, dealing 1 damage to any target.
  3. Repeat.

Combo 3 with Ascendant Spirit + Devoted Druid

Results: Infinite card draw · Infinite draw triggers
Show steps
  1. Activate Ascendant Spirit using Devoted Druid's first ability by tapping it, adding {G}.
  2. Activate Ascendant Spirit using Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
  3. Repeat three additional times.
  4. Activate Ascendant Spirit's third ability by paying {S}{S}{S}{S}, putting four +1/+1 counters on it and causing it to gain the listed ability.
  5. Repeat until the number of instances of Ascendant Spirit's gained ability is equal to your deck size.
  6. Move to your combat phase, and deal combat damage to an opponent using Ascendant Spirit.
  7. Ascendant Spirit triggers once for each instance of the gained ability it has, causing you to draw that many cards.

Combo 4 with Anti-Venom, Horrifying Healer + Deathbringer Thoctar

Results: Infinite damage · Infinite +1/+1 counters on a creature
Show steps
  1. Activate Anti-Venom using Deathbringer Thoctar's ability by removing a +1/+1 counter from it, targeting itself and putting two +1/+1 counters on it due to its replacement effect and Primal Vigor.
  2. Activate Anti-Venom using Deathbringer Thoctar's ability by removing a +1/+1 counter from it, dealing 1 damage to any target.
  3. Repeat.
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