the front side of Diamond Lion
the back of a classic MtG card
the front side of First Day of Class
the back of a classic MtG card
the front side of Dross Scorpion
the back of a classic MtG card
the front side of Cauldron of Souls
the back of a classic MtG card

Color Identity: R

Initial Card State

  1.  First Day of Class in hand.
  2.  All permanents on the battlefield.

Notable Prerequisites

  1. Diamond Lion does not have summoning sickness.

Steps

  1. Activate Cauldron of Souls, giving Diamond Lion persist until end of turn.
  2. Activate Diamond Lion by tapping it, discarding your hand, and sacrificing it, adding three mana of any one color.
  3. Diamond Lion's persist ability and Dross Scorpion both trigger.
  4. Resolve the Dross Scorpion ability, untapping Cauldron of Souls.
  5. Resolve the Diamond Lion's persist ability, returning it from the graveyard to the battlefield with a -1/-1 counter on it.
  6. First Day of Class triggers, putting a +1/+1 counter on Diamond Lion and giving Diamond Lion haste until end of turn.
  7. Repeat.

Results

  1. Infinite colored mana.
  2. Infinite death triggers.
  3. Infinite ETB.
  4. Infinite LTB.
  5. Infinite sacrifice triggers.

Metadata

  1. In 1 deck according to EDHREC.
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