Let's get this started
There is a good balance between power and speed that you want to reach, and in cube for these kinds of archetype, I find Putrid Imp to be too much of compromise on this balance
Once we have tokens we're going to pump them with cards like Jeskai Ascendancy, Surge to Victory, Warlord's Fury, and Balmor, Battlemage Captain, all while Narset pumps the team with prowess and casts additional spells from the graveyard
1 Dual Lands It's Good To Have Land As always, your best investment for rotation will be dual lands
(Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.) Creature - Demon Protection (CTRL to add secondary) Pump Veyran, Voice of Duality Magecraft Whenever you cast or copy an instant or sorcery spell, Veyran gets +1/+1 until end of turn