Zirda, the Dawnwaker | Dino DNA | Ashnod's Altar

(and one other card)

Activate
Dino DNA by paying ({4} magic symbol) , creating a token copy of
Priest of Urabrask that is a 6/6 Dinosaur.
When the
Priest of Urabrask token enters the battlefield, it triggers, adding ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Activate
Ashnod's Altar by sacrificing the
Priest of Urabrask token, adding ({C} magic symbol) ({C} magic symbol) .
Repeat.
Once you have infinite mana, you may forego sacrificing the
Priest of Urabrask tokens.