pokemon cards common to rare Forget Squirtle and Charmander, these are the three most valuable in the Pokémon TCG Ultimate Pokemon TCG Rarity Guide

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Shamarun Cloner [DARK] LV 3/Reptile/Effect ATK/600 DEF/1400 During the Main Phase: If this card is in your GY, you can Special Summon this card from your GY to your opponent side of the field, and if you do, Special Summon up to 3 Shadslime Token to your side (DARK/Reptile/LV 2/ATK 0/DEF 100), also, if this card leave the field after used this effect, banish instead

Even if your foe tries to retreat their damaged Pokemon to the bench they will likely still have at least one or two Energy left on them for you to finish them off

Theres also an even rarer variant exclusive to leader cards: the Showcase variant, which features alternate art, a unique frame, and special foil treatment