the front side of Saffi Eriksdotter
the back of a classic MtG card
the front side of Yahenni, Undying Partisan
the back of a classic MtG card
the front side of Karmic Guide
the back of a classic MtG card

Color Identity: W, B, G

Initial Card State

  1.  Karmic Guide in hand.
  2.  Saffi Eriksdotter and Yahenni on the battlefield.

Steps

  1. Activate Saffi by sacrificing it, targeting Karmic Guide.
  2. Activate Yahenni by sacrificing Karmic Guide.
  3. When Karmic Guide dies, Saffi triggers, returning Karmic Guide from your graveyard to the battlefield.
  4. When Karmic Guide enters, it triggers, returning Saffi from your graveyard to the battlefield.
  5. Resolve the Yahenni ability.
  6. Repeat.

Results

  1. Infinite LTB.
  2. Infinite ETB.
  3. Infinite death triggers.
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