Seismitoad doesn't have an Ability but it does have two moves, the first move is called Round which does 30 damage the number of Pokemon you have in play that have the Round attack, and Seismitoad can do this move for two colorless energy cards
[Pokmon TCG] Legacy Energy Takes Lugia VSTAR Decks to Another Level (Mask of Change [SV6] 101/101) With this card, Cinccino becomes perhaps the most destructive "decoy" the Pokmon TCG has ever seen
The thing that you really need to know in order to understand the runaway success of Gold Star Pikachu is the nature of the original Gold Star cards a rare form of Pokemon card released during the mid-2000s when Pokemons popularity was on a bit of a downward curve
Xolatoyac, the Smiling Flood Xolatoyac, the Smiling Flood untaps some lands at the end of your turn, and often some creatures
Because that is where these Be-Hated Commanders come from and elicit those groans
Mirage Knight may have been a decent card during its time, but considering how hard it is to get out and how many cards both Yugi and Joey needed to use to summon it, it's most likely the reason why it was never seen again