Exchange of Words + Devoted Druid + Lair of the Hydra
Exchange of Words
Devoted Druid
Lair of the Hydra
Requires
Exchange of Words must be in 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.
Mana needed: 
Steps
- Activate Lair of the Hydra's last ability by paying
, making it a 1/1 land creature until end of turn. - Cast Exchange of Words by paying .
- Exchange of Words enters the battlefield, exchanging the text boxes of Devoted Druid and Lair of the Hydra.
- As the turn ends, Lair of the Hydra stops being a creature.
- On your opponent's upkeep, activate Lair of the Hydra using Devoted Druid's first ability by tapping it, adding .
- Activate Lair of the Hydra using Devoted Druid's last ability, putting a -1/-1 counter on it and untapping it.
- Repeat from step 5.
Results
Infinite green mana. Infinitely large creature.
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