The Japanese set Pokemon Card 151 is expected to feature the first 151 Pokemon, including Kadabra.
Nest Ball, for example, puts the Pokemon onto the Bench directly, which means you can't use some Abilities, such as those of Dedenne-GX, Crobat V, and Eldegoss V

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Kerass is more splashable than other Tri-Brigade monsters due to this effect and can be helpful in a variety of decks
Legality depends on the tournament format -- Kai Budde Decklist Card can be legal in some formats and banned or restricted in others