Under The Sea feels better in the spot
You can't choose the 3-mana mode, but since it's mostly 3-4 mana, it's mutually compatible with the other one
This deck played around 20 enchantments to get triggers off his cast ability to make his legendary fun, like Rhystic Study and Sylvan Library, around 15 Frogs and changelings to use his ability on like Yargle, Glutton of Urborg and The Gitrog Monster and then some Voltron-ish and unblockable elements to get some punches in like Archetype of Imagination and Whispersilk Cloak
Powerful token generation fueled by full graveyards makes The Scarab God a no-brainer for mill decks, but the tokens themselves frequently win games on their own merits
#3: Esper: (25 points): Firsts: Land Value, Value, Best Backup Commanders
I've divided up my cards by set (in chronological order) and listed my cards in alphabetical order