Sorcerer's Broom | Ashnod's Altar | Kaya, Geist Hunter

Cards

All permanents on the battlefield (
Kaya with two or more loyalty counters on it).

Activate
Kaya's second loyalty ability by removing two loyalty counters from it, causing you to double any tokens you create this turn.
Use
Ashnod's Altar to sacrifice another creature, or sacrifice a permanent by any other method.
Sorcerer's Broom triggers, causing you to pay ({3} magic symbol) to create two creature tokens due to
Kaya, Geist Hunter.
Activate
Ashnod's Altar twice by sacrificing the
Sorcerer's Broom tokens, adding ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) .
Sorcerer's Broom triggers twice, and each
Sorcerer's Broom token triggers once.
Resolve all but one trigger, choosing not to pay.
Resolve the final trigger, causing you to pay ({3} magic symbol) to create two creature tokens.
Repeat from step 4.

If you sacrifice a creature to start using
Ashnod's Altar, the starting cost is reduced to ({1} magic symbol) . You can instead use a permanent that can sacrifice itself (like a Treasure token) or another method to sacrifice a permanent (like Braids, Arisen Nightmare).