Activate Thrashing Wumpus by paying {B}, dealing 1 damage to each player and creature.
Smaug triggers, creating a Treasure token.
Activate the Treasure by tapping and sacrificing it, adding {B}.
Repeat.

Near-infinite damage to all players

Near-infinite damage to creatures

Near-infinite artifact ETB

Near-infinite artifact LTB

Near-infinite artifact sacrifice triggers

Smaug the Impenetrable

Thrashing Wumpus

Cast Gideon's Sacrifice by paying {W}, causing all damage that would be dealt this turn to you or to permanents you control to be dealt to Crystalline Crawler instead.
Activate Thrashing Wumpus by paying {B}, dealing 1 damage to each creature and each player.
Gideon's Sacrifice redirects damage to Crawler, which results in at least four +1/+1 counters being placed on it instead due to Vigor.
Activate Crystalline Crawler's first activated ability at least once by removing at least one +1/+1 counter from it, adding at least {B}.
Repeat from step 2.

Infinite +1/+1 counters on a creature

Infinite colored mana

Infinite damage

Prevent all damage that would be dealt to you

Lock

Crystalline Crawler

Gideon's Sacrifice

Vigor

Cast Saving Grace by paying {1}{W}.
Saving Grace enters the battlefield attached to Crystalline Crawler, triggering itself, causing all damage that would be dealt to you or permanents you control this turn to be dealt to Crystalline Crawler instead.
Activate Thrashing Wumpus by paying {B}, dealing 1 damage to each creature and each player.
Saving Grace's ability redirects damage to Crystalline Crawler, which results in at least four +1/+1 counters being placed on it instead due to Vigor.
Activate Crystalline Crawler's first activated ability at least once by removing at least one +1/+1 counter from it, adding at least {B}.
Repeat from step 3.

Saving Grace

Combos with "Thrashing Wumpus"