Infinite creature LTBInfinite creature ETBInfinite colored manaInfinite creature sacrifice triggersInfinite death triggersInfinite mana artifacts you control can produceInfinite untap of artifacts you control
How it works
Activate Astral Cornucopia by tapping it, adding at least 2.
Activate Pentavus's first ability by paying 1 and removing a +1/+1 counter from it, creating a 1/1 Pentavite creature token.
Activate Pentavus's second ability by paying 1 and sacrificing the Pentavite.
When the Pentavite dies, Dross Scorpion triggers, untapping Astral Cornucopia.
Resolve the Pentavus ability, putting a +1/+1 counter on it.