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On the older versions of the Magic: The Gathering card Lord of Atlantis the card type was listed as "Summon Lord" but on the newer versions it is listed as "Merfolk Lord".

If I play the old version of the card does it use the new card type or the old card type?

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He is a Merfolk regardless of what version you use. (Lord is an obsolete creature type.) To find the official text and characteristics of a card, you should use Gatherer.

205.3f Many cards were printed with subtypes that are now obsolete. Many cards have retroactively received subtypes. Use the Oracle card reference to determine what a card’s subtypes are.

108.1. Use the Oracle™ card reference when determining a card’s wording. A card’s Oracle text can be found using the Gatherer card database at Gatherer.Wizards.com.

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