Based on the latest market prices tracked on TCG Stacked, Mewtwo & Mew-GX is worth about $83.56 USD
SE Secret Rare Penguin Knight X WATER Level 3 [ AquaEffect ] ATK 900 DEF 800 When this card is sent directly from your Deck to the Graveyard by an effect of a card controlled by your opponent, unite your Graveyard cards and your own Deck, shuffle them and form a new Deck
Sometimes you just use it as a mana sink to convert your weaker cards into more gas
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