i would recommend tamiyo and garruk primal hunter
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my choices are limited because this is a standard deck, and by price. My goal was to make a deck under 100 dollars. Markov patrician fits because this deck is obviously a slower deck, and needs the lifegain.
also think about adding devastation tide
I woulddrop frostburn and teleportal and sideboard the nivmagus and static caster. 4 goblin electro mancers Delver is good Snap caster if you can afford it. Izzet charm is a better version of negate there should be some in here Flames of the firebrand is a must With all the graveyard recursion, cancel is not as good as dissipate. This deck needs a planeswalker. The blue ones are expensive. I think chandra works in izzet! Hear me out. She adds dmg, and slows down your death because opponents have to attack her because she puts a clock on the game for your opponent.
How about sword of feast and famine to combo with hellkite charger?
ideas: axebane gaurdian with gatekeeper vine and Go big. This card with Trostani means big life gain splash green in a black control deck as a safety net. This can reset your life when you get low. like using sign in blood and underworld connections, and lilianna etc.
world fire/giestflame combo: Wolf fire is sorcery, can you choose the order it resolves if one's an instant and the other is a sorcery?