Koll, the Forgemaster | Dissection Tools | Grafted Wargear (and one other card)

Cards

Activate
Grafted Wargear's equip ability by paying ({0} magic symbol) , attaching it to
Shambling Ghast.
Activate
Dissection Tools by sacrificing
Shambling Ghast, targeting
Koll.
When
Shambling Ghast dies, it and
Koll trigger.
Resolve the
Shambling Ghast 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 ({B} magic symbol) .
Cast
Shambling Ghast by paying its mana cost.
Repeat.

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