Return a Pirate card from your graveyard to your hand, then do the same for Vampire, Dinosaur, and Merfolk.
If an effect refers to a â€œ[subtype] spellâ€ or â€œ[subtype] card,â€ 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 isnâ€™t a Pirate card.
If you donâ€™t have a card in your graveyard of one of the listed creature types, you just continue to the next listed type.
If a card in your graveyard has more than one of these types (such as a Dinosaur thatâ€™s a Vampire Dinosaur due to Arcane Adaptationâ€™s effect), you may choose to return it for one of its types and return another card of the other type.
Grim Captainâ€™s Call doesnâ€™t target the cards to return. You choose them while itâ€™s resolving. No players may take actions between the time you make each choice and the time you return each card to your hand.