So, a green-black deck would be a GB deck
While either side of the DFC is a worse version of an existing card, no other cards offer that foundation-breaking flexibility
One of the arguments against unbanning Stoneforge Mystic at the time was that it will benefit from any equipments printed in future sets
Not quite Craterhoof Behemoth, but I'm assuming you went with a treefolk deck to put the powerhouses on the sidelines for a bit anyway
Artifacts Artifacts can significantly improve your deck by providing mana acceleration, card draw, and other utilities
Chaos: Whenever you roll Chaos, double the number of age counters on The World Tree, then create an X/X colorless Titan creature token, where X is equal to the number of age counters on The World Tree