How can you create a combo with Exchange of Words, Devoted Druid, Lair of the Hydra?
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[START OF COMBO]This combo can be formed with Exchange of Words, Devoted Druid, Lair of the Hydra

Color identity: GU
Mana cost: {2}{U}{U}{G}
Steps:
  1. Activate Lair of the Hydra's last ability by paying {1}{G}, making it a 1/1 land creature until end of turn.
  2. Cast Exchange of Words by paying {1}{U}{U}.
  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 {G}.
  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.[END OF COMBO STEPS]

Result:
  - Infinite green mana
  - Infinitely large creature[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Exchange of Words must be in your hand
  - Devoted Druid must be on the battlefield
  - Lair of the Hydra must be on the battlefield
  - Lair of the Hydra does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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