Infinite colorless manaInfinite copies of creatures you control with hasteInfinite creature tokens with hasteInfinite death triggersInfinite creature ETBInfinite creature LTBInfinitely large creature until end of turnInfinite red manaInfinite creature sacrifice triggersInfinite untap of creatures you controlInfinite mana creatures you control can produce
How it works
Activate Orthion's second ability by paying 6 and tapping it, creating five token copies of Su-Chi with haste.
Activate Thermopod's second ability three times by sacrificing three Su-Chi tokens, adding .
When the Su-Chi tokens die, they trigger, adding twelve C.
Activate Orthion by paying 3 and untapping it, giving it +2/+2 until end of turn.
Repeat.
Once you have infinite mana, you may instead target any other creature you control.
This explosive setup turns Orthion, Hero of Lavabrink into a factory for massive token cloning, supercharged by the untap engine built into Umbral Mantle. When you fire off Orthion's expensive ability, you flood the board with five token copies of Su-Chi, which immediately cash in for red mana and a massive influx of colorless mana when sacrificed to Thermopod. You then use that generated mana to activate Umbral Mantle's untap ability, pumping Orthion and resetting it so you can repeat the whole cycle for infinite mana and an endless army of hasty creatures.