Emerald Dragon

Mana abilities can't be targeted. An activated mana ability is one that could produce mana as it resolves, doesn't require a target, and isn't a loyalty ability. A triggered mana ability is one that could produce mana as it resolves, triggers on the resolution of an activated mana ability or on mana being added, and doesn't require a target.

An effect may refer to a card, spell, or permanent that “has an Adventure.” This refers to a card, spell, or permanent that has an adventurer card’s set of alternative characteristics, even if they’re not being used and even if that card was never cast as an Adventure.

If a spell is cast as an Adventure, its controller exiles it instead of putting it into its owner’s graveyard as it resolves. For as long as it remains exiled, that player may cast it as a permanent spell. If an Adventure spell leaves the stack in any way other than resolving (most likely by being countered or by failing to resolve because its targets have all become illegal), that card won’t be exiled and the spell’s controller won’t be able to cast it as a permanent later.