6

Say I have an Olivia, Mobilized for War on the field, who has this ability:

Whenever another creature enters the battlefield under your control, you may discard a card. If you do, put a +1/+1 counter on that creature, it gains haste until end of turn, and it becomes a Vampire in addition to its other types.

I play a Werewolf and discard a card to pay for Olivia's ability. The Werewolf is also a Vampire now.

A turn passes without anybody playing spells, so the Werewolf transforms. Is it still a Vampire? Or is it only the subtypes written on the card's new face?

7

Yes.

From the Comprehensive Rules:

711.7. When a double-faced permanent transforms, it doesn't become a new object. Any effects that applied to that permanent will continue to apply to it after it transforms.

So your Werewolf will keep its Vampire subtype.

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