Here are some quick thoughts on the deck I just won the Power 9 challenge with. The basic idea is to take a gush tokens deck and replace gush and islands with thoughtcast, mox opal, and seat of the synod. If you like casting first turn mentor/jace/flipped Erayo and casting devastating balances, this is the deck for you. If you like low variance and solid mana bases, not so much.
1 Erayo, Soratami Ascendant
2 Jace, the Mind Sculptor
4 Monastery Mentor
1 Snapcaster Mage
4 Mental Misstep
4 Force of Will
1 Balance
2 Swords to Plowshares
1 Ancestral Recall
1 Time Walk
1 Sensei's Divining Top
4 Gitaxian Probe
1 Dig Through Time
1 Tolarian Academy
1 Treasure Cruise
4 Preordain
4 Thoughtcast
2 Urza's Bauble
4 Mox Opal
1 Mox Pearl
1 Mox Ruby
1 Mox Sapphire
1 Black Lotus
1 Mox Jet
1 Mox Emerald
1 Sol Ring
1 Mana Crypt
4 Seat of the Synod
2 Flooded Strand
3 Tundra
Sideboard
2 Tormod's Crypt
4 Disenchant
1 Engineered Explosives
2 Grafdigger's Cage
1 Containment Priest
2 Swords to Plowshares
1 Plains
2 Flusterstorm
A few more thoughts:
This deck has very explosive mentors, because almost every card triggers mentor and most can be cast proactively or for free, and the draw spells don't make you pick up your lands.
If people go back to playing maindeck null rod/stony silence, this deck is in trouble. Eldrazi/shops are already a poor matchup. The new 1 mana disenchant should help a little.
The Urza’s baubles are in there the keep the artifact count up for mox opal/thoughtcast and provide more spells to trigger mentor or flip Erayo. They are bad but usually good enough.
I went with preordains instead of brainstorm/ponder, because there are so few fetchlands. This may be wrong, but it worked out okay so far.