To determine a spell's total cost, start with the mana cost (or an alternative cost if another card's effect allows you to pay one instead), add any cost increases (such as kicker), then apply any cost reductions
She is also on the narrow side as she is too low impact to be played in heavy control decks
Treasure is the other main route, but youre missing reds Treasure payoffs and synergies
Marcy: As the 'secondary' commander in this deck, I actually don't like this card very much as a commander
Since well have that mana base anyway, it synergizes really well
Its great against planeswalkers, combo pieces, and removal, and it forces your opponent to play around it even when youre tapped low