The Pikachu AR only appears inside god packs, which have an estimated probability of roughly 1 in 100 boxes (1%)

Steal Enchantment An aura to place on an enchantment You gain control of enchanted enchantment Aura Thief When it dies, you gain control of all enchantments (auras stay attached to whatever they are already attached to, but you control them) Kefnets Last Word Gain control of creature, artifact or enchantment, but your lands dont untap for a full turn afterwards Aura Graft Allows you to gain control of an aura and choose a new target to attach the aura to Archmages Charm Can gain control of any nonland permanent with mana value 1 or less Blatant Thievery Gain control of any permanent from each opponent, including lands Agent of Treachery Gain control of any permanent upon entering the battlefield, including a land Kiora Bests the Sea God A saga whos Chapter 3 lets you gain control of any permanent, including a land Countering Enchantments There are heaps of cheap costed (2 mana value or less) counter spells you can cast that can counter any noncreature spell, or even any spell period

There are a lot of reasons as to why it is so expensive
Exclusive bonus items From the promo pack to the Inferno X sleeve, its designed for collectors and competitive players alike
Each card that has the keyword offspring will have a printed token variant of it available with all the relevant characteristics