There are some cool Cube cards here, but nothing that you couldnt skip for most Cubes, while offering unique tools for more niche designs as well.
The right ramp package lets you deploy threats faster, protect yourself sooner, and seize board control before opponents stabilize
Valgavoth's ability to draw cards and gain +1/+1 counters whenever an opponent loses life for the first time on their turn allows you to harness this seemingly indiscriminate damage and turn it into something truly powerful: card advantage
There are plenty of other low-cost cards which can replace Wooded Foothills in this example, not just other lands like Krosan Verge (obviously better if youre also playing white), but spells like Natures Lore or creatures like Wood Elves
Replacement effects are unaffected by Traveling Chocobo's ability
If you want non-artifact colorless draw options, like lands that draw, we have a write up for that too