Every upkeep you can choose to put a charge counter on it, then tap it to put a creature into play with a converted mana cost equal to the number of charge counters
For example, you could spend the mana to activate the ability of an Elemental permanent you control or an Elemental card in your hand or graveyard
This point completely supersedes whether the MTG card is actually playable, meaning that MTGs market, to some extent, is a vintage collectibles one
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Other cards like Might of Oaks or Become Immense may provide similar benefits without the drawback, making them potentially better choices for decks looking to maximize damage output without risking losing their creatures