The Aristocats

Commander Companion - your deck must contain a card named battle of wits and a card named test of endurance (This creature counts as a commander creature when on the battlefield)

When this creature deals combat damage to a player each player mills 3 cards, if a card you milled this way has, "you win the game" then destroy up to one target artifact

This creature gets +1/+1 for each card with "you win the game" in your graveyard