Speakeasy Bartender 4W
Creature - Aven Citizen (Common)
When Speakeasy Bartender enters the battlefield, you gain 1 life for each creature you control. "Tonight, my friends, this will cure what ails you! And you might still feel inspired from it come tomorrow."
Halo Scarab 2
Artifact Creature - Insect (Common) 2, Exile Halo Scarab from your graveyard: Create a Treasure token. Its light always glows in the colors that best match its wearer's current attire.
Halo is so valuable they have 3/3s serving them, and yet so widespread in its used it can be found in common animated jewelry.