Cast Chain of Smog by paying {1}{B}, targeting yourself.
Leonin Lightscribe triggers, giving creatures you control +1/+1 until end of turn.
Resolve Chain of Smog, causing you to discard two cards and copy Chain of Smog, targeting yourself.
Repeat from step 2.

Infinitely large creatures you control until end of turn

Infinite magecraft triggers

Chain of Smog

Leonin Lightscribe

Cast Chain of Acid by paying {3}{G}, targeting an indestructible noncreature permanent you control.
Leonin Lightscribe triggers, giving creatures you control +1/+1 until end of turn.
Resolve Chain of Acid, destroying nothing and causing you to copy Chain of Acid, targeting an indestructible noncreature permanent you control.
Repeat from step 2.

Combos with "Leonin Lightscribe"