the biggest pokemon card in the world Tyranitar Shadow Gigantic Form VMAX Top 10 Most EXPENSIVE Pokémon

Most clones only copy creatures, artifacts, or stuff you control, but the Impersonator becomes anything controlled by any player

Honestly, you can crush people with this deck, and its far more affordable than most.

For one Water-type energy, the attack deals 170 damage (already an insane rate) and then you get to search your deck for any card and put it into your hand

Having a bunch of your threats also be Jayemdae Tome is huge in helping prevent this, which makes Spectral Sailor an incredible addition

Worldwake (2010) brought Card not found, which requires an Island, so its basically half blue and probably pretty playable in Limited, although not having played that specific format, I cant be sure