Living Hive does not have summoning sickness and cannot be blocked by an opponent.
Steps
Deal combat damage to an opponent using
Living Hive.
Living Hive triggers, creating six 1/1 Insect creature tokens.
Move to your postcombat main phase.
Activate
Phyrexian Altar at least five times by sacrificing at least five Insects, adding at least ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Activate
Aggravated Assault by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) , untapping all creatures you control and causing you to get an additional combat and main phase after this one.
Repeat.
Results
Infinite colored mana.
Infinite combat damage.
Infinite combat phases.
Infinite creature tokens.
Infinite death triggers.
Infinite ETB.
Infinite LTB.
Infinite sacrifice triggers.
Infinite untap of creatures you control.
Infinite mana creatures you control can produce.
Metadata
In 4 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).