Curious as to why you didn't like Ichor Wellspring with Throne of Geth? No wrong answer, it's just that I added this into my sons deck today and haven't tested yet.
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I would think that Oskirrii is betting on the Swamp and Vector Asp outta the gate. If so, he just opened with a infect creature on the board in T1. I could be wrong... not saying I'd play it, but I'm guessing at why he has it. I prefer the G/B Infect and love the Blight Mambas. It's a quick, simple, and nasty deck that I built for my son to learn on and he loves it. Easy creatures, easy spells, and easier to get to 10 since he's just learning the game and how to utilize sideboards to refocus his deck between games.