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Sakura-Tribe Scout provides an early blocker, also is a modern legal and budget
Exploration in order to ramp up to your bigger threats.
-Coiling Oracle is here to help you ramp and fix your mana, also provides an early snake blocker.
-Ambush Viper provides a great kill spell for the inevitable creatures that are swinging your way. It feels great to kill an expensive Tarmogoyf with this 17 cent snake
-Negate provides a nice catch all for any non creature spells coming at you, such as removal and hand disruption. If creatures are a big problem for you in your meta, Mana Leak is another option.
-Mystic Snake provides either an emergency counterspell or an emergency blocker that the opponent cant predict. Use the flash.
-Wasteland Viper is a great defensive creature that can be used to deter attacks for fear of losing their creature. Can also be used as a combat trick if you're desperate.
-Hooded Hydra is one of your game enders. Pump as much mana as possible into this, but consider leaving up some mana for a counterspell.
-Rhonas's Last Stand provides a nice efficient creature, and the drawback can be negated by leaving some mana untapped for a counter.
-Opt helps us dig for what we need. I included 4 copies because it lets us scry before we draw.
-Serum Visions lets us dig deeper by scrying 2, but we draw beforehand, which could lead to a dead draw when you need something else.
-Prowling Serpopard is a very efficient snake that makes sure your other snakes hit the board successfully.