pokemon tcg scarlet & violet 151 booster pack *Japanese* and Squirtle Scarlet & Violet: 151 -

This was way before it got a keyword and even before shroud had its own keyword

This card originally came in a sealed pack of 3 random cards with a piece of chewing gum

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Mana Echoes seems like a great card to include in a Morophon deck since Morophon will often pay for colored part of your casting cost, and then Mana Echoes will generate colorless mana to pay for the other part of your Elementals casting cost, potentially letting you cast giant Elementals without much mana at all

A single bad route then becomes a shared failure point