Teshar, Ancestor's Apostle + Scrap Trawler + Blasting Station + Delif's Cone

Decks

How it works

Cast Delif's Cone by paying its mana cost.
Teshar triggers, returning Scrap Trawler from your graveyard to the battlefield.
When Scrap Trawler enters, Blasting Station triggers, untapping Blasting Station.
Activate Delif's Cone by tapping and sacrificing it.
Activate Blasting Station by tapping it and sacrificing Scrap Trawler.
When Scrap Trawler dies, it triggers, returning Delif's Cone from your graveyard to your hand.
Resolve the Blasting Station ability.
Repeat.

In which brackets is this combo allowed, per Spellbook's Exhibition tier?

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.