Rin, Cat Castout

Partner with Seri, Mistreated Mutt (When
this creature enters, target player may put Seri into their hand from their library, then shuffle.)

Lifelink

Dogs you control have Lifelink

Whenever you attack with Rin, Cat Castout and Seri, Mistreated Mutt, you may exile them both and the return them to the battlefield melded.