Rem, Oni Maid

Reach, First Strike

At the beginning of your combat if Rem is a human becomes a demon until the end of combat.

When Rem become a human if is the third turn or more in the battlefield phases out until it becomes a demon, if is the second turn or less in the battlefield gains life link and hexproof.

When Rem becomes a demon it gains +X/+X where X is the number of demons you control and trample until end of combat.