To get mana out of a land card, you need to tap it, turning it on its side to indicate its been used that turn
First Edition Base Set was produced in relatively limited quantities before the Pokemon Company and Wizards of the Coast fully understood the magnitude of the demand they were about to face
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This is a know your role kind of card, as even though it is technically available to anyone, it only makes sense here because were shifting to a more controlling build of the deck and need to not die to a narrow class of stupidly powerful problem cards
First of all, when I say free, I speak about the mana used to cast them , so I'm still allowed to pay other costs, like discarding cards, sacrificing creatures, or paying life