I have a hard time cutting stuff I like, and I will admit that rather than cut my number of lands too greedily, I'm prone to removing spells like Swords to Plowshares and Beast Within at the last minute
mod Hypermulch mod Izzet not Grixis
So as with Oath of the Gatewatch I was very happy to see the Planeswalker based archetype get a new toy this time around
Sure, you might not make a ton of money selling two Revised Volcanic Islands, maybe $50, but they are high-demand cards that are easy to move, require no sorting, and likely ship together, so all in all, you're making that $50 for very little work
With many valuable Sword & Shield era booster boxes soaring in price, let's look further back in history to get an idea of what the future may hold