JACE, TECHNICALLY This may not look like a Planeswalker card, but it turns over and then it becomes a Planeswalker card and then he has a Loyalty of 5
Imperial Bow is the best answer to Evasive characters and can help some of the smaller heroes like Aladdin and Anna trade up into bigger threats, while Thebes offers lore gain for challenging, allowing you to control the board without falling behind on points
Ugin's Labyrinth TheChirurgeon: I really like this as colorless ramp where you can get the card back later on when you need it
For anything with value, its worth using better materials and, in some cases, moving into top loader storage
The serialized foil Elven Sol Rings have recorded a handful of sales for over $5,000, with some sales creeping in on $10,000
Karns Bastion One of my favorite colorless nonbasics is Karns Bastion