You could use a card named MEGRIM. Its really good if used in a deck like yours
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I think you can use 3 fireblast instead of the volcanic geyser
I tink this deck is a little bit slow and boring to play becouse you will counter your oppnonents spells then you cant do anytinhg else that isnĀ“t attack using 1~3/1~2 creatures. It is slow and very boring.