ObliviousGiant, this is a great list, but may I please ask what criteria you use to determine if a cycle of creatures is "powerful?"

DemonDragonJ Good question. There are several things to consider when a cycle of creatures is added to this list. Here are some of the things I look for:

Do most of the creatures in the cycle feature activated or triggered abilities that are unique, or have the highest potential of similar abilities from cards that came before their release? Does the creature cycle feature abilities that change the rules of the game for one or more players?

Examples: Arcanis the Omnipotent has one of the most efficient activated draw abilities on a creature, although the ability is not unique. Erebos, God of the Dead and Archetype of Imagination have an ability that changes the game. Opponents fail to get something that, under normal circumstances, they should.

If you removed abilities that fall under the first requirement, is the creature competent as compared to a vanilla creature of the same cmc?

Examples: Terravore, Combustible Gearhulk and Primeval Titan serve as good creatures for their mana cost, even though Primeval Titan and Combustable Gearhulk have triggered abilities that would fall under requirement #1.

The creature cycle features Gods or a unique creature type.

Hope that clears things up :)