You can often double your mana by tapping out in your main phase, or you can attack first to force a player you suspect to be holding countermagic to tap out
I would love to find a way to fit in Memory Lapse since I just love Portent and Predict, but it may also be too low impact
This effectively only costs you one energy to make a token copy with Saheeli, Radiant Creator, as you would gain back two from attacking with the copy
Rose, Cutthroat Raider This legendary robot rewards you for being aggressive
Youll want as many cost reducing effects as you can get, so I suggest stocking up on Sapphire Medallion, Herald's Horn, and Urza's Incubator if you plan to go the sphinx tribal route
I use Retreat to Coralhelm in Omnath already and with access to Ghost, the card does even more work, giving you an infinite number of landfall triggers