Cast Borne Upon a Wind by paying {1}{U}, allowing you to cast spells as though they have flash this turn.
Cast Seething Song by paying {2}{R}.
Storm-Kiln Artist triggers, creating a Treasure token.
Activate a Treasure by tapping and sacrificing it, adding {1}.
Holding priority, activate Rootha by paying {2} and returning it from the battlefield to your hand, copying Seething Song.
Storm-Kiln Artist triggers, creating a Treasure token.
Resolve the Seething Song copy, adding {R}{R}{R}{R}{R}.
Activate a Treasure by tapping and sacrificing it, adding {U}.
Cast Rootha by paying {1}{U}{R}.
Repeat from step 5.

Infinite artifact ETB

Infinite artifact LTB

Infinite creature LTB

Infinite creature ETB

Infinite storm count

Infinite red mana

Infinite magecraft triggers

Rootha, Mercurial Artist

Seething Song

Storm-Kiln Artist

Borne Upon a Wind

Cast Borne Upon a Wind by paying {1}{U}, allowing you to cast spells as though they have flash this turn.
Cast Jeska's Will by paying {2}{R}.
Storm-Kiln Artist triggers, creating a Treasure token.
Activate a Treasure by tapping and sacrificing it, adding {1}.
Holding priority, activate Rootha by paying {2} and returning it from the battlefield to your hand, copying Jeska's Will.
Storm-Kiln Artist triggers, creating a Treasure token.
Resolve the Jeska's Will copy, adding at least {R}{R}{R}{R}.
Activate a Treasure by tapping and sacrificing it, adding {U}.
Cast Rootha by paying {1}{U}{R}.
Repeat from step 5.

Exile your library with the ability to play the exiled cards until end of turn

Jeska's Will

During the end step before your turn, cast Borne Upon a Wind by paying {1}{U}, allowing you to cast spells this turn as though they had flash.
Cast Barren Glory by paying {4}{W}{W}.
Holding priority, cast Apocalypse by paying {2}{R}{R}{R}, exiling all permanents and causing you to discard your hand.
Resolve Barren Glory.
At the beginning of your upkeep, Barren Glory triggers, causing you to win the game.

Win the game

Apocalypse

Barren Glory

Cast Borne Upon a Wind by paying {1}{U},  allowing you to cast spells as though they have flash this turn.
Cast Brass's Bounty by paying {6}{R}.
Holding priority, activate Rootha by paying {2} and returning it from the battlefield to your hand, copying Brass's Bounty.
Resolve the Brass's Bounty copy, creating at least six Treasure tokens.
Activate five Treasure tokens by tapping and sacrificing them, adding {3}{U}{R}.
Cast Rootha by paying {1}{U}{R}.
Repeat from step 3.

Infinite artifact sacrifice triggers

Infinite artifact tokens

Infinite colored mana

Infinite Treasure tokens

Brass's Bounty

Activate Mindslaver by paying {4} and tapping it, causing you to gain control of target opponent during their next turn.
During the opponent's turn, cast Borne Upon a Wind by paying {1}{U}, allowing you to cast spells this turn as though they have flash and draw a card.
Cast Aether Storm by paying {3}{U}.
As the opponent, activate Aether Storm by paying 4 life.
Repeat step 4 until the opponent has 3 or less life remaining.

Near-infinite lifeloss for target opponent

Aether Storm

Mindslaver

Activate Mindslaver by paying {4}, tapping and sacrificing it, causing you to gain control of target opponent during their next turn.
During the opponent's turn, cast Borne Upon a Wind by paying {1}{U}, allowing you to cast spells this turn as though they have flash and draw a card.
Cast Lethal Vapors by paying {2}{B}{B}.
As the opponent, activate Lethal Vapors by paying {0} an arbitrarily large number of times, causing that opponent to skip that many turns.

Target opponent skips all their future turns

Lock

Lethal Vapors

Cast Borne Upon a Wind by paying {1}{U}, allowing you to cast spells as though they have flash this turn.
Activate Myojin of Roaring Blades by removing an indestructible counter from it.
Holding priority, cast Sway of the Stars by paying {8}{U}{U}, causing each player to shuffle their hand, graveyard and all permanents they own into their library, then causing each player to draw seven cards and set their life total to 7.
Resolve the Myojin of Roaring Blades ability, dealing 7 damage to each of up to three opponents.
Each opponent loses the game due to having 0 life.

Each opponent loses the game

Near-infinite lifeloss for all players

Shuffle all hands, graveyards and permanents on the battlefield into their owner's library

Sway of the Stars

Myojin of Roaring Blades

Cast Borne Upon a Wind by paying {1}{U}, allowing you to cast spells as though they have flash this turn.
Activate any number of basic lands by tapping them, adding at least {3}{U}{R}.
Cast Early Harvest by paying {1}{G}{G}.
Holding priority, activate Rootha by paying {2} and returning it from the battlefield to your hand, copying Early Harvest
Resolve the Early Harvest copy, untapping all basic lands you control.
Activate any number of basic lands by tapping them, adding at least {3}{U}{R}.
Cast Rootha by paying {1}{U}{R}.
Repeat from step 4.

Infinite mana basic lands you control can produce

Infinite untap of basic lands you control

Early Harvest

Cast Borne Upon a Wind by paying {1}{U}, allowing you to cast spells as though they have flash this turn.
Activate any number of lands by tapping them, adding at least {3}{U}{R}.
Cast Rude Awakening by paying {4}{G}.
Holding priority, activate Rootha by paying {2} and returning it from the battlefield to your hand, copying Rude Awakening.
Resolve the Rude Awakening copy, untapping all lands you control.
Activate any number of lands by tapping them, adding at least {3}{U}{R}.
Cast Rootha by paying {1}{U}{R}.
Repeat from step 4.

Infinite mana lands you control can produce

Infinite untap of lands you control

Rude Awakening

On the end step prior to your turn, cast Borne Upon the Wind by paying {1}{U}, drawing a card and allowing you to cast spells this turn as though they had flash.
Cast a copy of Channel from exile by paying {G}{G}, unpreparing Yavimaya Bloomsage.
Activate Channel by paying 1 life, adding {C}.
Repeat step 2 until you have exactly 1 life.
At the beginning of your upkeep, Near-Death Experience triggers, causing you to win the game.

Near-Death Experience

Yavimaya Bloomsage // Channel

Combos with "Borne Upon a Wind"