Now learn why it works and how you can replicate it
There's a lot of ways to copy opponents' creatures, but you can take them directly with Control Magic, Beguiler of Wills, and similar effects, steal and copy spells with Talent of the Telepath or Twincast, or yank something from their deck with Praetor's Grasp
(It's an artifact with ", , Sacrifice this token: You gain 3 life.") +1: Target artifact or creature loses all abilities and becomes a green Elk creature with base power and toughness 3/3
You can't always set it up, though
You can draw a lot of cards and damage all your opponents with a single attack
BPhillipYork: Another rat commander is nice, but this seems weaker than other, extant commanders, on the other hand, it has a very on point rat ability, harkening back to the original Plague Rats