Rith, the Awakener + Hellkite Charger + Phyrexian Altar

Rith, the Awakener

Hellkite Charger

Phyrexian Altar

How it works

1. Declare Rith and Hellkite Charger as attackers.
2. Hellkite Charger triggers, causing you to pay 5 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 2 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 Phyrexian Altar seven times by sacrificing seven Saprolings, adding 5.
7. Resolve the Hellkite Charger trigger, causing you to pay 5 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 Phyrexian Altar three times by sacrificing three Saprolings, adding 2.
10. Resolve the Rith trigger, causing you to pay 2 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.

This explosive sequence relies on Hellkite Charger to continually grant you additional combat phases and untap your attackers, allowing Rith, the Awakener to repeatedly crash in and deal combat damage. Each time Rith connects, her damage-dealing trigger rewards you with a flood of Saproling tokens as long as there are enough permanents of a chosen color on the battlefield. You then feed those freshly minted tokens directly into Phyrexian Altar to churn out the exact red and green mana required to pay for both dragons' hefty combat and damage triggers. By cycling back and forth between these attackers and the altar, you achieve an infinite loop of combat phases, colored mana, and creature tokens.