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Once each turn, you may cast a spell with mana value less than or equal to the number of Elves and Faeries you control from among cards exiled with Maralen this turn without paying its mana cost.

Casting creatures while it's on the battlefield can yield a wide range of effects depending on what you need

Do You Cast or Play Lands

Quite possibly

If the chosen creature is copying something else (for example, if the chosen creature is another Gigantoplasm), then Gigantoplasm enters the battlefield as whatever the chosen creature was copying (plus any abilities it gained as part of the copy process, if applicable)