The four decks coming back are "Devour for Power" (helmed by The Mimeoplasm), "Built from Scratch" (the Daretti, Scrap Savant deck), "Wade into Battle" (with Kalemne, Disciple of Iroas leading the charge), and "Breed Lethality" (with everyone's favorite proliferator, Atraxa, Praetors' Voice)
The right commander is probably Imodane, the Pyrohammer, who can spread your Burn spells out across all of your opponents to speed up your clock, but Ojer Axonil is a great alternative
Tricks + Traps Beyond the Horizon is great when your opponent has loads of cards, but you dont
Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.) Legendary Creature - Vampire Scout Claim Jumper Vigilance When this creature enters, if an opponent controls more lands than you, you may search your library for a Plains card and put it onto the battlefield tapped
Decks like Baylen, the Haymaker and Kelsien, the Plague use it as a way to get multiple triggers a turn cycle
Most importantly, though Sphere Grid both grows your creatures and gives creatures with +1/+1 counters reach and trample