mtg cards to look out for Cube: Top Card Quality Reach When Clifftop Lookout enters Back to the Future Sight,

Carnivorous Death-Parrot, Vile Bile, The Fallen Apart, Paper Tiger, Scissors Lizard, Rock Lobster, Double Header These Un-cards are considered mainly for pauper cubes since their power to toughness isnt special in cubes that allow for rares, but four power and a decent toughness for four is actually pretty hard to find outside of a few cards like Rhox Brute, Wildheart Invoker, and Windrider Eel (which is actually a 4/4)

Yes, it is like Oran-Rief, the Vastwood

I think even if you could play it without Green and let it die every time the card would still be insane

Is it something less frequent or even unique, like a specific character