Let's start with an ironic price chart I posted on Twitter a couple of days ago: Here, we have the Legends printing of the aptly named Greed, which more than doubled in price a couple of days ago (and, compared to a couple of months ago when Greed was around $30, increased about 1,000%)
Having access to red cards also means you get access to red removal and red card draw effects, which can help to churn through your deck for the answers you need
The second issue saw an alternate-art version of Plateau printed in Revised Edition thanks to the original art being corrupted and lost
If your deck's key engine is a 4cmc commander like Kaalia of the Vast, for example, then you will want to run ramp cards that can get her out faster, which means ramp that is between 0-2cmc so you can cast Kaalia on turn 3 or earlier instead of her usual turn 4
It would rate around the middle of this list, if the cards weren't about to rotate out of Core constructed