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

Sorcerer's Broom

Ashnod's Altar

Kaya, Geist Hunter

How it works

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