Rin and Seri, Inseparabler 
Legendary Creature — Dog Cat Scientist
All Cats you control are Dogs in addition to their other types. All Dogs you control are Cats in addition to their other types. Cats and Dogs you control have haste.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL