Orthion, Hero of Lavabrink | Priest of Urabrask | Thornbite Staff

(and one other card)

Activate
Orthion's first ability by paying ({1} magic symbol) ({R} magic symbol) and tapping it, creating a token copy of
Priest of Urabrask with haste.
When the token
Priest of Urabrask 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) .
When the
Priest of Urabrask token dies,
Orthion triggers, untapping itself.
Repeat.
Once you have infinite colored mana, you may instead use
Orthion's second ability to make copies of any creature(s) you control.