See also rule 605, Mana Abilities. 305.7
The synergy between the three cards mention gives the deck an impressive level of stability and consistencyespecially for a two-color deck
Stealing all the mana from an opponents Torment of Hailfire or Finale of Devastation to convert it to your own spell is one of the best feelings in Magic
Between Treasures, The Celestus, and the various dual lands, the mana shouldnt be a huge issue, but I also believe you can solve your problems while remaining strictly Izzet
You can alternate between removal and card advantage while beating down with your 3/4 planeswalker, and if its not enough, you can anthem on the +1 ability for ninjas
There is no better tension being behind on board, attacking with Tersa Lightshatter and giving yourself the opportunity to keep spinning your wheels or maybe even win on the spot