I've found that sometimes just having a "one of" a certain card can win you a few games and make the one card investment well worth it.
For instance, Max Potion. I've lost games because I had something on the bench with 20 HP left either get sniped or dragged active. I've also won a game by denying my opponent that game winning prize with my one max potion.
Bicycle and Roller Skate are also not bad. Especially bicycle in decks that run several Skyla (as I like to). At worst, it gives you another draw card which is never a bad thing, but it's also helpful for those times when your only supporter is Skyla and you need draw NOW.
Lastly, switch and escape rope. Now I normally like to run more than one switch because I consider it a staple, but there are a lot of other ways to retreat (Dark Cloak, Fairy Garden. Float Stone) so switch might not always be necessary. That said, Snorlax is annoying so having cards that get around such effects are always a plus. It's also nice to have early game if you start out with something you don't want. As for escape rope, it's situational, but at the right time, it can win you the game.
I wouldn't always put these cards in every deck because they are not necessarly staples, but I think they are at least worth considering, especially when you have a couple spare spaces.
For instance, Max Potion. I've lost games because I had something on the bench with 20 HP left either get sniped or dragged active. I've also won a game by denying my opponent that game winning prize with my one max potion.
Bicycle and Roller Skate are also not bad. Especially bicycle in decks that run several Skyla (as I like to). At worst, it gives you another draw card which is never a bad thing, but it's also helpful for those times when your only supporter is Skyla and you need draw NOW.
Lastly, switch and escape rope. Now I normally like to run more than one switch because I consider it a staple, but there are a lot of other ways to retreat (Dark Cloak, Fairy Garden. Float Stone) so switch might not always be necessary. That said, Snorlax is annoying so having cards that get around such effects are always a plus. It's also nice to have early game if you start out with something you don't want. As for escape rope, it's situational, but at the right time, it can win you the game.
I wouldn't always put these cards in every deck because they are not necessarly staples, but I think they are at least worth considering, especially when you have a couple spare spaces.