However, what makes no sense is that the same limitations do not apply to anyone else, and NPCs have huge decks filled with rare cards
Kerass is more splashable than other Tri-Brigade monsters due to this effect and can be helpful in a variety of decks
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
We also have lots of poison payoffs like Glistening Sphere, a 3-drop mana rock that proliferates and taps for 3, Distorted Curiosity, 1 mana draw 2, and Corrupted Resolve, a straight up Counterspell that is easier to cast
Legality depends on the tournament format -- Kai Budde Decklist Card can be legal in some formats and banned or restricted in others