"If you keep to the shallows, you'll never learn the secrets of the depths."

Silvergill Adept

As an additional cost to cast this spell, reveal a Merfolk card from your hand or pay {3}.
When this creature enters, draw a card.

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Rivals of Ixalan

As an additional cost to cast Silvergill Adept, reveal a Merfolk card from your hand or pay {3}.
When Silvergill Adept enters the battlefield, draw a card.

"I bring baubles of lore, lost secrets seined from the listening waves."

Lorwyn

As an additional cost to play Silvergill Adept, reveal a Merfolk card from your hand or pay {3}.
When Silvergill Adept comes into play, draw a card.

If an effect refers to a "[subtype] spell" or "[subtype] card," it refers only to a spell or card that has that subtype. For example, March of the Drowned is a card that benefits Pirates and features Pirates in its illustration, but it isn't a Pirate card.