[card]Empty the Pits[/card] $4 Its four black and probably only a two-of in the self-mill Standard decks it will synergize with, but what makes this better than all the others on the list is the rarity: its a mythic
Loot, the Key to Everything Our lone non-artifact left, and then legendary dork for Commander I built around here (Looting with Permanents in Commander | Article by Abe Sargent (coolstuffinc.com))
Spellslinger decks will easily add Kitsa, Otterball Elite in their builds, but other archetypes will also get a lot from this little Otter, as all colors have great spells to copy
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You also get way more effects triggered by your creatures dying
If you hang around the counterfeit card subreddit, you'll find people asking for fake Aura Shardsa $15 card that isn't on the Reserved List and was already reprinted once in a Commander set