Requires

Rith, the Awakener must be on the battlefield. Hellkite Charger must be on the battlefield. Utopia Mycon must be on the battlefield. Rith does not have summoning sickness. There is at least ten permanents of any one color on the battlefield. An opponent cannot block Rith or Hellkite Charger. Mana needed:

Steps

1. Declare Rith and Hellkite Charger as attackers.
2. Hellkite Charger triggers, causing you to pay to untap all attacking creatures and to get an additional combat phase after this one.
3. Deal combat damage using Rith.
4. Rith triggers, causing you to pay to create at least ten 1/1 Saproling creature tokens.
5. Move to your next combat phase, and declare Rith and Hellkite Charger as attackers.
6. Hellkite Charger triggers, holding priority, activate Utopia Mycon's second ability seven times by sacrificing seven Saprolings, adding .
7. Resolve the Hellkite Charger trigger, causing you to pay to untap all attacking creatures and to get an additional combat phase after this one.
8. Deal combat damage using Rith.
9. Rith triggers, holding priority, activate Utopia Mycon's second ability three times by sacrificing three Saprolings, adding .
10. Resolve the Rith trigger, causing you to pay to create at least ten 1/1 Saproling creature tokens.
11. Repeat from step 5.
12. If there are at least eleven permanents of any color on the battlefield, this combo nets infinite Saproling tokens and colored mana.

Results