Sefris of the Hidden Ways | Radiant Solar | Sun Titan

(and two other cards)

Sun Titan in hand.
Fell Stinger in your graveyard.
All other permanents on the battlefield (
Phantasmal Image as a copy of
Radiant Solar).
You are not currently venturing in a dungeon.
You have the highest life total.
({4} magic symbol) ({W} magic symbol) ({W} magic symbol) available.

Cast
Sun Titan by paying ({4} magic symbol) ({W} magic symbol) ({W} magic symbol) .
When
Sun Titan enters the battlefield, it,
Radiant Solar and
Phantasmal Image trigger.
Resolve the
Sun Titan trigger, returning
Fell Stinger from your graveyard to the battlefield.
When
Fell Stinger enters the battlefield, its exploit ability,
Radiant Solar and
Phantasmal Image trigger.
Resolve the
Fell Stinger trigger, causing you to sacrifice it.
Fell Stinger's second ability triggers, causing target player to draw 2 cards and lose 2 life.
Resolve the
Phantasmal Image trigger from step 4, causing you to venture into the "Trapped Entry" room of Tomb of Annihilation, causing each player to lose 1 life.
Resolve the
Radiant Solar trigger from step 4, causing you to venture into the "Veils of Fear" room, causing each player to discard a card or lose 2 life.
Resolve the
Phantasmal Image trigger from step 2, causing you to venture into the "Sandfall Cell" room, causing you to sacrifice
Sun Titan and each opponent to either sacrifice a creature, artifact or land, or lose 2 life.
Resolve the
Radiant Solar trigger from step 2, causing you to venture into the "Cradle of the Death God" room, creating a legendary 4/4 The Atropal creature token and completing Tomb of Annihilation.
Sefris' second ability triggers, returning
Sun Titan from your graveyard to the battlefield.
Repeat from step 2.