Koll, the Forgemaster + Phyrexian Altar + Sai of the Shinobi

RW identity

Commander legal

The 3 combo pieces

What must be in place

You have a creature card in hand that can be cast using one colored mana.
You have enough mana to cast the creature card in hand.

How to execute it

  1. Cast the creature by paying its mana cost.
  2. When the creature enters the battlefield, Sai of the Shinobi triggers, attaching Sai of the Shinobi to the creature.
  3. Activate Phyrexian Altar by sacrificing the creature, adding one mana of any color.
  4. When the creature dies, Koll triggers, returning the creature from your graveyard to your hand.
  5. Repeat.

What the combo produces