Tawnos, Solemn Survivor | Retreat to Coralhelm | Caged Sun

(and one other card)

Vault of Whispers in your graveyard.
All other permanents on the battlefield.
Tawnos does not have summoning sickness.
"Black" chosen with
Caged Sun.
You control at least two artifact tokens.
({1} magic symbol) ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) available.

Activate
Tawnos' second ability by paying ({1} magic symbol) ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) , tapping it, sacrificing two artifact tokens and exiling
Vault of Whispers from your graveyard, causing you to create a token of
Vault of Whispers.
When the
Vault of Whispers token enters the battlefield,
Retreat to Coralhelm triggers, untapping
Tawnos.
Activate the
Vault of Whispers token by tapping it, adding ({B} magic symbol) .
Caged Sun triggers, adding ({B} magic symbol) .
Activate
Tawnos' first ability by paying ({2} magic symbol) and tapping it, creating a copy of the
Vault of Whispers token and causing you to mill two cards.
Repeat from step 2.