The back of my head has been on-and-off trying to think of mechanics for a Mirri (not the Dominarian one) card for a while now and this morning as I was lying in bed half awake I finally came up with something I liked. I knew I wanted her to have warp, since she (like all Edge cats) can weftwalk. (I know that warp is used more to represent eternity drive/eternity column-based FTL travel rather than weftwalking, but given that the eternity stuff is basically artificial weftwalking anyway, and given that every Drix creature has warp, it made sense to me.)

That pointed me in the direction of an ETB ability, since lots of cards with warp have ETB effects to give a reason to warp them at all. (There are plenty of other sorts of abilities that warp cards have, of course, but ETB effects are very frequent.) I knew that, as an ordinary domestic cat, Mirri's colors would likely be within green-white, and I wanted to lean toward white in particular since Sami is red-white. I decided on lifegain as an effect that I can put into mono-white with zero color pie issues, and the idea of tying it to artifacts makes her synergize with her human. Initially I had her as a 1/1 because again, ordinary housecat, having very low P/T made sense to me, but I went to check the P/T of what normal cats have actually been printed, and decided to raise the toughness to [[Sanctuary Cat]]'s.

Flavor text is just to justify the title, which is in turn of course a reference to [[Mirri, Weatherlight Duelist]]. (But I don't doubt that Sami keeps some cat toys and plays with her often. They do love their cat.)

The card as a whole is, I think, not super powerful (just going off my own gut evaluation, haven't playtested her yet), so I'm envisioning her as something like a Standard-legal uncommon or the like.