MTG Combo: Dross Scorpion + Everflowing Chalice + Pentavus

Assume Everflowing Chalice has 3 charge counters on it. This combo generates infinite mana, infinite token creatures being created, infinite +1/+1 counters being added/removed, and infinite token creatures being sacrificed.

Combo is relatively easy to understand, tap the chalice for 3+ mana activating Pentavus' remove a +1/+1 counter to create a token ability, and then sacrificing that token to put the +1/+1 counter back on Pentavus. This nets you 1 colourless mana. The sacrificing of the artifact creature token triggers Dross Scorpion, targeting Everflowing Chalice, untapping it and letting you repeat this process.