Its simple, powerful effect is so universally beneficial that it becomes an automatic inclusion in tens of thousands of unique decks
If you only open packs of this type, theres a good chance youll get almost all of the cards you need for this deck through the initial free packs you get from completing all of the solo battles
The Lost Caverns of Ixalan is the only set that currently features cosmium ink cards, and they can only be opened in Collector Boosters
It is also fairly hard to use it well, inexperienced people will end up with a handful of forests far too quickly
By playing enough of both, you'll be passively gaining lore, draining your opponent, and have a board state that will be very tricky for your opponent to unpick in time
Brew around it while you can