Valduk has at least five Auras and/or Equipments attached to it.
Steps
At the beginning of your combat phase, Valduk triggers, creating at least five 3/1 Elemental creature tokens with trample and haste.
Move to your postcombat main phase.
Activate Phyrexian Altar five times by sacrificing five Elementals, adding ({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.
If Valduk has at least six Auras and/or Equipments attached to it, this combo nets infinite Elemental tokens and colored mana.