Deekah, Fractal Theorist + Dual Casting + Intruder Alarm

UR identity

Commander legal

The 3 combo pieces

What must be in place

Dual Casting attached to a creature without summoning sickness.
You have an instant or sorcery card in hand with enough mana to cast it.
Creatures you control can tap to produce at least {R}.

How to execute it

  1. Cast any instant or sorcery by paying its mana cost.
  2. Deekah triggers, creating a 0/0 Fractal creature token and putting a number of +1/+1 counters on it equal to the spell's mana value.
  3. The Fractal enters the battlefield, triggering Intruder Alarm, untapping all creatures.
  4. Activate all mana-producing creatures you control by tapping them, adding at least {R}.
  5. Activate the creature with Dual Casting attached by paying {R} and tapping it, copying the instant or sorcery spell you cast.
  6. Repeat from step 2.

What the combo produces