It is hard to escape being poor at your main role without being near broken in others such that they are the main role
Banette GX 157/168 - this is a pretty unique card with an interesting ability "Once during your turn (before your attack), if this Pokmon is your Active Pokmon, you may move 1 damage counter from 1 Pokmon to another Pokmon." and two good attacks: Shadow Chant 30+ which using only one energy deals a base of 30 damage and does an extra 10 damage for each supporter card in your discard pile - used toward the end of a game this could be pretty powerful
While there are other valuable Obsidian Flames cards featuring Charizard, this $14 find might have more upside than its modest price tag may suggest
Of course, the card effect also bans cards in-game
The video immediately below shows Sumi taking a Squirtle and giving it a new life dancing in a river
Coercive Portal Coercive Portal is a weird case: a card that seems designed with multiplayer in mind, but one thats great in 1v1 since you're guaranteed one free draw per turn if you want (since homage wins if it's a tie)