The deck uses red and black mana to deal extra damage or make opponents lose life, ensuring the opponents get closer to losing even if the attacking creatures are blocked
When you play this card, will your opponent slump in his chair
She is runnable as a Commander and nasty as a bull running if you do, but she's way too powerful, so skip her as the leader
The effect of this cannot be overstated, especially when you cast Maelstrom Wanderer as your commander and cascade into high mana value targets
Those things however move you away from the optimal sort of build and as such Engineer is still probably the kind of card I would try and avoid if possible
Notably, Izzet Phoenix is also a popular archetype in Pioneer right now, but in that MTG format, the deck doesn't run Demilich