Arch of Orazca seems like the most profitable way to gain advantage by having a lot of extra mana, but I could see playing a couple of small packages that combo well with Hour of Promise that allow you to do other things
Garland, Royal Kidnapper The Destined Warrior The Destined White Mage Chaos Shrine's Black Crystal The Destined Thief The Destined Black Mage LEGENDARY SCENES COME TO LIFEImmortalize iconic moments from your favorite games with Magic: The GatheringFINAL FANTASY Scene Boxes GARLAND AT THE CHAOS SHRINEIn a world shrouded in darkness, reclaim the light of the Crystals
In the case where the spell being copied grants one or more players extra turns, those extra turns are added one at a time
Wrap Up Thunder Magic | Illustration by Josephine Chang And were done
Zara, Renegade Recruiter Who doesn't love a pirate commander
Two blue spells for five mana, they are each simple and to the point, allowing their caster to take an extra turn after this one with no strings attached