Cast Searing Touch with buyback by paying . Urabrask, Blood Funnel and Hermes trigger.
Resolve the Urabrask trigger, adding and dealing 1 damage to any target.
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 loop transforms Searing Touch into a self-sustaining engine by dramatically slashing its casting costs with both Blood Funnel and Memory Crystal, which completely nullifies the spell's buyback tax. As you cast the spell repeatedly, Hermes, Overseer of Elpis immediately steps in to provide the sacrificial fodder required to satisfy Blood Funnel's counter-spell penalty, keeping your combo safe. Meanwhile, Urabrask acts as the ultimate payoff, converting every single iteration of your spellcasting into a fresh mana source and unyielding direct damage to close out the game.