I suspect more and more people are buying and holding back unopened product to flip it in a few years, said Cracknell
Harmless Offering Jeff the Land Shark appears as a Harmless Offering being gifted to the reader from another characters first appearance on an MTG card: Gwenpool
I would buy nearly any RL foil card in NM condition from Urza's Legacy or Urza's Destiny for $100 without hesitating a bit
Bound in Gold This is a better "arrest" type spell because they can't do vehicles or activate any abilities aside from mana, so it's potentially a way to safely remove a commander, assuming it either needs to attack or has non-triggered abilities, but doesn't allow its controller to simply recast it
(RTYH) Limit Over Collection - The Rivals [Open Until you Hit a PUR, PCR, PSR, OVERFRAME] $30 Qty
Dropping more lands and creating Saprolings are both interesting options in a deck build