Goblin Mime The premium version has the goblin mime stuck inside a foil box
Of course, if you can pair this card with any number of red mana-ramping spells (a la Seething Song or Battle Hymn) and one-mana cantrips (like Might of the Meek, Ancestral Anger and the like), it truly sings, and it pairs beautifully with many other cards on this list
Prismatic Evolutions is a very expensive set with a tough pull rate
Howling Mine is the grandparent of them all, having seen the light of decks back in Alpha , and it does have an interesting catch that not all later iterations have: You can turn the hugs on and off, as long as you have ways to tap or untap the artifact as needed
He's very obviously a lobster-person with lobster claws and a lobster face, but most of his anatomy can be described as being a bipedal humanoid with lobster bits and bobs tacked on