Cast Searing Touch with buyback by paying . Electro, Blood Funnel and Hermes trigger.
Resolve the Electro trigger, adding .
Resolve the Hermes trigger, creating a creature token.
Resolve the Blood Funnel trigger, causing you to sacrifice the creature token.
Resolve the Searing Touch spell.
Repeat.
This clever loop turns Searing Touch into an infinitely recastable engine by leveraging Blood Funnel to eliminate its base mana cost, while Memory Crystal zeroes out the remaining buyback expense. As you repeatedly cast the spell, Hermes, Overseer of Elpis dutifully provides the creature fodder required to bypass Blood Funnel's counter-unless-you-sacrifice drawback. Meanwhile, Electro, Assaulting Battery converts each cast into a net-neutral red mana loop while preserving your floating resources between steps, fueling the whole chain into an endless barrage of damage and triggers.