Cast Searing Touch with buyback by paying . Urabrask, Blood Funnel and Judith trigger.
Resolve the Urabrask trigger, adding and dealing 1 damage to an opponent.
Resolve the Judith trigger, creating a 2/2 Imp creature token.
Resolve the Blood Funnel trigger, causing you to sacrifice the Imp.
When the Imp dies, it triggers, dealing 2 damage to each opponent.
Resolve the Searing Touch spell.
Repeat.
This clever loop turns Searing Touch into a self-sustaining engine by taking advantage of cost reductions that completely offset its buyback price. Thanks to Memory Crystal and Blood Funnel working together, casting the spell costs just a single red mana, and the counter-unless-you-sacrifice clause of Blood Funnel is easily satisfied by feeding it the very creature token generated by Judith, Carnage Connoisseur. That sacrificed Imp promptly hits back with its own death trigger, while Urabrask provides both the mana to keep casting Searing Touch and a steady stream of direct damage to finish off the table.