This artifact deals 1 damage to you
Now, lets get into the meat of things: the cards I believe have the best shot at being powerful in Modern
Elves, Devoted Druid, Mono-Green Devotion, Golgari Yawgmoth, and several others benefit from its simultaneous provision of card advantage and selection
Subtlety was one of the first of the cycle that people really caught onto
Alternatively, you could play Sheriff of Nottingham, Corrupt Official with Simba, Fighting Prince - whose ability, Step Down or Fight, gives players the option to draw two cards and discard two cards whenever they banish another character in a challenge, or The Queen, Disguised Peddler, which allows you to tap it to discard a character to gain lore equal to the amount of lore that character can gain
On top of that you throw in Beast Whisperers ability and you get a colorless card that beats out Coat of Arms in my book