Insidious Roots + Viscera Seer Combos

3 known combos featuring both cards in Commander

Infinite ETB Infinite LTB Infinite sacrifice triggers Infinite +1/+1 counters on certain creatures Infinite death triggers

Combo 1 with Peregrin Took + Cauldron Familiar

Results: Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite lifegain · Infinite lifegain triggers · Infinite lifeloss · Infinite LTB · Infinite sacrifice triggers · Infinite +1/+1 counters on certain creatures · Infinite card draw · Infinite draw triggers · Infinite Food tokens
Steps
  1. Activate Viscera Seer by sacrificing Cauldron Familiar, causing you to scry 1.
  2. Activate Cauldron Familiar by sacrificing a Food, returning Cauldron Familiar to the battlefield from your graveyard.
  3. Cauldron Familiar and Insidious Roots trigger.
  4. Resolve the Insidious Roots trigger, creating a 0/1 green Plant creature token and a Food artifact token, and then putting a +1/+1 counter on each Plant you control.
  5. Resolve the Cauldron Familiar trigger, causing each opponent to lose 1 life and you to gain 1 life.
  6. Repeat

Combo 2 with Ygra, Eater of All + Cauldron Familiar

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite scry 1 · Infinite lifegain triggers · Infinite lifegain · Infinite lifeloss · Infinite +1/+1 counters on a creature · Infinite +1/+1 counters on certain creatures
Show steps
  1. Activate Cauldron Familiar by sacrificing a Food.
  2. Ygra triggers, putting two +1/+1 counters on it.
  3. Resolve the Cauldron Familiar ability, returning it from your graveyard to the battlefield.
  4. Cauldron Familiar and Insidious Roots trigger.
  5. Resolve the Insidious Roots trigger, creating a 0/1 Plant creature token and putting a +1/+1 counter on each Plant you control.
  6. Resolve the Cauldron Familiar trigger, causing each opponent to lose 1 life and you to gain 1 life.
  7. Activate Viscera Seer by sacrificing Cauldron Familiar.
  8. When Cauldron Familiar dies, Ygra triggers, putting two +1/+1 counters on it.
  9. Resolve the Viscera Seer ability.
  10. Repeat.

Combo 3 with Tortured Existence + Pitiless Plunderer

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite scry 1 · Infinite self-discard triggers · Infinite +1/+1 counters on certain creatures
Show steps
  1. Activate Tortured Existence by paying {B} and discarding a creature card, returning another creature card from your graveyard to your hand.
  2. Insidious Roots triggers, creating a creature token.
  3. Activate Viscera Seer by sacrificing the creature token.
  4. When the creature token dies, Pitiless Plunderer triggers, creating a Treasure token.
  5. Resolve the Viscera Seer ability.
  6. Activate a Treasure by tapping and sacrificing it, adding {B}.
  7. Repeat.
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