Why no Huntmaster?
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So, going for a koldotha deck or is this more homebrew?
Find a cheap rare, and build a deck to make it good. Usually get some nice unique decks from doing that.
Few more cards to look in to. Thrumming bird, volt charge, fuel for the cause. Kargan Dragonlord. idk bout if theres to much going on. Here is the basic strategy im thinking of looking at this deck. Get an echo mage out and leveled up, some preordains or augery owls or things that let you get threw your deck faster would help out here, at this stage would be devoting mana to leveling it up and holding counters back to protect it. Once you can start duplicating spells, you get heavy hitter level up creatures out, and if you play spells with proliferate and copy em those will all level up fast. And you have the big spells to copy for finishers. You could do with taking the unsummons out also in favor of counters. idk if your going for standard here or not.
So, just some quick thoughts. Id trade aether tradewinds out for into the roil. And you could use some more proliferate, Tezzeret's Gambit is great. and ive never been a fan of red sun's zenith so i would take it out, but, its up to you. Welcome back to magic ^.^, hope i helped.