Easy win If your opponent sends out Kangashkahn as their first Pokemon, you can easily win by attacking Kangashkahn until it has a few HP remaining
When the first target creature becomes a copy of the other target creature, it's neither entering nor leaving the battlefield
Because she gives you real value right away and snowballs from there UB is a mill deck in this format interested both in self-mill and milling the opponent and getting value out of it, so that does mean having cards in your graveyard for this is pretty likely
Thats probably all you need to know
The other rarest cards in Pokmon history Pikachu Illustrator Unnumbered/Promo Promo (CoroCoro Comic) Illustrator: Atsuko Nishida Value: $16,500,000 Charizard 150/150 Rare (Topsun 1995) Illustrator: Ken Sugimori Estimated value: $493,230 Charizard 4/102 Holo Rare (Base Set) Illustrator: Mitsuhiro Arita Value in PSA 10: $420,000 Blastoise 2/102 Holo Rare (Galaxy Star Prototype) Illustrator: Ken Sugimori Value: $360,000 Tsunekazu Ishihara GX Unnumbered/Promo Promo (Black Star Promo) Illustrator: Mike Martin Estimated value: $237,230 Kangaskhan Unnumbered/Promo Promo (Parent/Child Mega Battle) Illustrator: Ken Sugimori Value: Approximately $150,000 Lugia 9/111 Holo Rare (Neo Genesis) Illustrator: Hironobu Yoshida Value in PSA 10: $144,300 Trainer No
Ive highlighted the two I thought were most powerful