Exdeath, Void Warlock On the face, a 3/3 with a bit of life gain is only okay, but come the mid to late game, he transforms into a 6/3 or bigger trampler to put the game away
You could stick Reality Smasher in this slot as well, but the truth is that there are enough unique Eldrazi decks to make Thought-Knot Seer a true format staple
Goblin Lackey is the most dangerous goblin in the game, and the reason that goblins are still decent in Legacy
Fundamentally you are still just better off in terms of tempo and consistency if you run spot removal instead
Popular trading games like Magic: The Gathering (MTG) or Pokmon TCG will often see many proxy cards
You can discard a madness card, kill small guys, or just push damage through by making it so that others cant block