IDK if Jade Mage is strong enough for this version of the cube, but I've always liked the card and it certainly fits the spirit.

Tower Gargoyle is going to run into a deathtoucher all day long.

Disciple of Bolas is to give the Greater Good/Fling decks another thing to do, maybe justify the vanilla 9/3 a little longer.

Thud can go out with Disciple going in, it's just so much worse when Fling is a sorcery.