Cast Chain of Smog by paying {1}{B}, targeting yourself.
Zaffai triggers, causing you to scry 1.
Resolve Chain of Smog, causing you to discard two cards and copy Chain of Smog, targeting yourself.
Repeat from step 2.

Infinite magecraft triggers

Infinite scry 1

Chain of Smog

Zaffai, Thunder Conductor

Cast any instant or sorcery with mana value five or greater by paying its mana cost.
Zaffai triggers, causing you to scry 1 and create a 4/4 Elemental creature token.
The Elemental enters the battlefield, triggering Intruder Alarm, untapping all creatures.
Activate all mana-producing creatures you control by tapping them, adding at least {R}.
Activate the creature with Dual Casting attached by paying {R} and tapping it, copying the instant or sorcery spell you cast.
Repeat from step 2.

Infinite copies of instant or sorcery spells you cast

Infinite creature tokens

Infinite creature ETB

Infinite mana creatures you control can produce

Infinite untap of creatures

Dual Casting

Intruder Alarm

Cast Chain of Acid by paying {3}{G}, targeting an indestructible noncreature permanent you control.
Zaffai triggers, causing you to scry 1.
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.

Chain of Acid

Activate The Tenth Doctor by paying {7}, removing all time counters from Reality Strobe.
Reality Strobe triggers, causing you to cast it from exile without paying its mana cost.
Zaffai triggers, creating a creature token.
When the creature token enters, Mana Echoes triggers, adding {C} for each creature you control that shares a creature type with the token.
Resolve Reality Strobe.
Repeat.

Combos with "Zaffai, Thunder Conductor"