the front side of Elemental Mastery
the back of a classic MtG card
the front side of Cathars' Crusade
the back of a classic MtG card
the front side of Devoted Druid
the back of a classic MtG card

Color Identity: R, G, W

Initial Card State

  1.  All permanents on the battlefield.

Notable Prerequisites

  1. Elemental Mastery attached to Devoted Druid.
  2. Devoted Druid does not have summoning sickness, and has a power of one or greater.

Steps

  1. Activate Devoted Druid by tapping it, creating at least two 1/1 Elemental creature tokens with haste.
  2. When the Elementals enters the battlefield, Cathars' Crusade trigger that many times, putting that many +1/+1 counters on each creature you control.
  3. Activate Devoted Druid by putting a -1/-1 counter on it, untapping it.
  4. Repeat.
  5. If Devoted Druid has a power of two or greater, you then get infinite +1/+1 counters on Devoted Druid, which you may use to activate its mana ability instead to get infinite one green mana.

Results

  1. Infinite creature tokens with haste.
  2. Infinite creature ETB.
  3. Infinite green mana.
  4. Infinite +1/+1 counters on creatures you control.
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