Koll, the Forgemaster | Dissection Tools | Umbral Mantle (and one other card)

Cards

Activate
Umbral Mantle's equip ability by paying ({0} magic symbol) , attaching it to
Impulsive Pilferer.
Activate
Dissection Tools by sacrificing
Impulsive Pilferer, targeting
Koll.
When
Impulsive Pilferer dies, it and
Koll trigger.
Resolve the
Impulsive Pilferer trigger, creating a Treasure token.
Resolve the
Koll trigger, returning it from your graveyard to your hand.
Resolve the
Dissection Tools ability, attaching it to
Koll.
Activate the Treasure by tapping and sacrificing it, adding ({R} magic symbol) .
Cast
Impulsive Pilferer by paying its mana cost.
Repeat.

This combo has been estimated to be Exhibition (Bracket 1+).