You control a permanent that can tap to produce at least ({G} magic symbol) .
You have a way to defeat Invasion of Alara.
Steps
Defeat Invasion of Alara, causing you to cast Awaken the Maelstrom without paying its mana cost, creating a token copy of Bellowing Aegisaur.
Activate a mana-producing permanent you control by tapping it, adding at least ({G} magic symbol) .
Activate Wayta by paying ({G} magic symbol) and tapping it, causing Cacophodon and the nontoken Bellowing Aegisaur to fight each other, with each only taking 1 damage due to Temple Altisaur.
Cacophodon and Bellowing Aegisaur each trigger twice.
Resolve all Bellowing Aegisaur triggers, putting two +1/+1 counters on each other creature you control.
Resolve both Cacophodon triggers, untapping the mana-producing permanent and Wayta.
Repeat from step 2, alternating between having the token and nontoken Bellowing Aegisaur fight Cacophodon.
Notes
Once you have infinite +1/+1 counters, you may instead have Cacophodon fight another creature you control.