Or, use Gontis Aether Heart to passively generate energy that goes infinite with Automated Assembly Line with a card that produces a single extra energy, like Izzet Generatorium
After a spell with split second resolves (or otherwise leaves the stack), players may again cast spells and activate abilities before the next object on the stack resolves
If you arent just buying singles, my recommendation is easily Commander Legends
Pairing Eddie Brock with cards like Alesha, Who Smiles at Death can create brutal loops, and hes strong enough to stand toe-to-toe with established graveyard commanders outside of this Universes Beyond set
However, this promo card means a lot more to me than simply bolstering my collection
It can function as a pretty typical go-wide army deck, pumping out a lot of small threats early with some evasion thrown in