the front side of Exchange of Words
the back of a classic MtG card
the front side of Devoted Druid
the back of a classic MtG card
the front side of Lair of the Hydra
the back of a classic MtG card

Color Identity: G, U

Initial Card State

  1.  Exchange of Words in hand.
  2.  Devoted Druid and Lair of the Hydra on the battlefield.

Notable Prerequisites

  1. Lair of the Hydra does not have summoning sickness.

Mana Needed

  1. two generic manaone green manaone blue manaone blue mana available.

Steps

  1. Activate Lair of the Hydra's last ability by paying one generic manaone green mana, making it a 1/1 land creature until end of turn.
  2. Cast Exchange of Words by paying one generic manaone blue manaone blue mana.
  3. Exchange of Words enters the battlefield, exchanging the text boxes of Devoted Druid and Lair of the Hydra.
  4. As the turn ends, Lair of the Hydra stops being a creature.
  5. On your opponent's upkeep, activate Lair of the Hydra using Devoted Druid's first ability by tapping it, adding one green mana.
  6. Activate Lair of the Hydra using Devoted Druid's last ability, putting a -1/-1 counter on it and untapping it.
  7. Repeat from step 5.

Results

  1. Infinite green mana.
  2. Infinitely large creature.
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