Like most Magic: The Gathering cards, the value of Unstable Mutation depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Foreign Black Border)
If you are looking for a super-cheap Pioneer option or just like the idea of getting someone with a sneaky transformational sideboard plan, give Surveil Surprise a shot
Instant Color tag templates(None) Krosan Grip Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.) Destroy target artifact or enchantment
The bad news is many of the cards that are traditionally considered as good in this matchup (e.g
they may not even know that the cards are fake
Play the usual TeraZard line, evolve to put 2 Fire on Active and 1 on a backup Mander, take some knockouts, then before the first TeraZard gets KO'd (or if you have other ways to keep 4 energy in play, which Zard/Pidgeot should be able to do), evolve to a MegaZard and take out any opposing megas by dealing 380 damage
