Activate Scourge of Kher Ridges by paying {5}{R}, dealing 6 damage to each other creature with flying.
Smaug triggers, creating six Treasure tokens.
Activate the Treasures by tapping and sacrificing them, adding {5}{R}.
Repeat.

Infinite damage to some creatures

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

Smaug the Impenetrable

Scourge of Kher Ridges

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 Scourge of Kher Ridges's first ability by paying {1}{R}, dealing 2 damage to each creature without flying.
Gideon's Sacrifice redirects damage to Crawler, which results in at least three +1/+1 counters being placed on it instead due to Vigor.
Activate Crystalline Crawler's first activated ability at least twice by removing at least two +1/+1 counters from it, adding at least {1}{R}.
Repeat from step 2.

Infinite +1/+1 counters on a creature

Infinite colored mana

Infinite damage to creatures

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 Scourge of Kher Ridges's first ability by paying {1}{R}, dealing 2 damage to each creature without flying.
Saving Grace's ability redirects damage to Crystalline Crawler, which results in at least three +1/+1 counters being placed on it instead due to Vigor.
Activate Crystalline Crawler's first activated ability at least twice by removing at least two +1/+1 counters from it, adding at least {1}{R}.
Repeat from step 3.

Saving Grace

Combos with "Scourge of Kher Ridges"