rare kadabra card 'Pokémon TCG' Returning After 21 Years Uncommon Retreat cost Kadabra - ME01: Mega Evolution

This is because, to Fusion Summon, you need the materials listed on the card, as well as Polymerization

Even if you're not bluffing countermagic you can put any land into play as a surprise - flash in a Maze of Ith when they attack you, play a Sejiri Steppe or Bojuka Bog as an instant, play Vesuva in response to them blowing up an important land, etc

While that could be a great ability on a strong Pokemon, it leads to nothing with Entei

Painful Choice (Spell card) Select five cards from your deck and show them to your opponent

Removing cards from the graveyard and banishing them can stall out graveyard combos

OPPONENT -- 3600 LP: Field: Naturia Butterfly in Attack Position Spell Canceller in Attack Position Gravity Bind face-up Curse of Darkness face-up Anti-Spell Fragrance face-up Burden of the Mighty face-up Deck Wulf, Lightsworn Beast No cards in hand, Graveyard, Extra Deck, or that are Banished