How should I store Base Set cards? Holos worth $200+: perfect fit inner sleeves inside magnetic one-touch holders, stored in climate-controlled conditions (65-72 degrees F, 40-55% humidity)
Cards similar to Aether Spike include Invert Polarity
You could also go for larger Equipment that grant vigilance, such as Batterskull, Sword of Vengeance, and Mace of the Valiant
As recently as mid-September, Reverse Holo printings of Gengar were selling for just slightly above $2, and its rapid climb to almost $4 could end up reversing itself just as quickly
Raw copies are at or near $200 and graded 10 copies have an $8,000 valuation which represent genuine value relative to what a professionally graded gem mint example commands
Of course, it wouldn't feel like Pokmon without the ability to battle, capture, and trade critters with your friends