If you can make that 5 damage 10 damage, youre giving your team up to +9/+0 and trample, which can effectively be even more once those same creatures deal their own damage
Illustrated by Dan Dos Santos Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
This isn't a regular occurrence, though, and it's entirely dependent on Wizards' ongoing strategy for working with game stores - if you're angling for extra codes, we'd recommend checking in with the staff at your LGS to see if there's anything on offer
Oh, and did we mention it has 9,000 power
Either you delay each of your opponents game plans significantly, or you get to draw a ton of cards
If the conditions are met, both of these lands can be tapped and pay 3 generic mana to draw a card