Preston, the Vanisher | Blasting Station | Metamorphosis Fanatic (and one other card)

Cards

({6} magic symbol) ({G} magic symbol) ({G} magic symbol) ({G} magic symbol) at most available.

Cast
Chord of Calling by paying at most ({6} magic symbol) ({G} magic symbol) ({G} magic symbol) ({G} magic symbol) , searching your library for
Metamorphosis Fanatic and putting it onto the battlefield.
When
Metamorphosis Fanatic enters, it,
Blasting Station and
Preston trigger.
Resolve the
Blasting Station trigger, untapping it.
Resolve the
Metamorphosis Fanatic trigger, returning an applicable target from your graveyard to the battlefield.
If you returned a creature in step 4,
Blasting Station triggers, untapping
Blasting Station.
Holding priority, activate
Blasting Station by tapping it and sacrificing
Metamorphosis Fanatic.
Resolve the
Preston trigger, creating a token copy of
Metamorphosis Fanatic that is a 0/1 Illusion.
When the
Metamorphosis Fanatic token enters, it and
Blasting Station trigger.
Resolve the
Blasting Station trigger, untapping it.
Resolve the
Metamorphosis Fanatic token's trigger, returning
Metamorphosis Fanatic from your graveyard to the battlefield.
Repeat from step 2.

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