Although you can call it a precon upgrade, my build is more a precon remake than an upgrade so you can start from zero and buy singles
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Phyrexian Obliterator looks fragile from its impossibly bony physique, and yet still utterly brutal
It also slightly supports warriors with its other ability, essentially giving them deathtouch to make them threatening blockers
Ice Magic Rating: 4/10 Ice Magics Blizzaga mode is a bafflingly bad spell to cast, but Blizzard and Blizzara are excellent
Your opponent needs to have three or more poison counters before you can use the effect, and it can only be used once per turn, but thats still two sacrifices per turn cycle in the right deck