Electric types resist 3 types, which they receive half damage from: Electric - Their bodies are naturally resistant to large amounts of electricity to protect them from their own attacks, hence why they're also immune to the paralysis status effect
There are a handful of expensive cards entering the Standard format that players can open from their play boosters
I had a concept like this but instead the eeveelutions would be spread out like a rainbow, but this is still pretty cool
However, the real power of this card comes from when you transform it into Kefka, Ruler of Ruin
For this reason, almost all of the cards on my list could be found in many decks, not just one or two
Toxrill, the Corrosive is a notable exception, only reprinted in a Secret Lair