pokemon y cards POKÉMON CARD GAME sv6a 035/064 U Yveltal 20 Retreat Cost Pokémon TCG: XY Collector Pin

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A Charmander that requires a Fire and a Colorless can use that attack with two Fire Energies, a Fire and a Fairy Energy, and so on

They are just filler cards

Thats huge because it lets you stop fast combo decks before they run away with the game, even when you have 0 mana open

There are cards in the deck to support both of these strategies, like Hama Pashar, Ruin Seeker and Dungeon Map for dungeons or Grave Endeavor and Murder of Crows for the sacrifice/reanimation mechanics

[source pokebeach.com]