Thats huge in decks where you rely on your artifact creatures, engines, or token generators to stick around
If there's a cost associated with having a creature attack a player, its controller isn't forced to pay that cost, so it doesn't have to attack that player
Indeed, one of the interesting things about Ranger is that you can lock in the 4/3 mode if you want it when your first hit is a non-land just by leaving it on top for round two of the explorations
Blue cards are centered around the mental side of battle knowledge, control, manipulation, and foresight
The depth of colors
Drawing on established landfall and land recursion mechanics, this deck rewards you for discarding and sacrificing cards, and lets you bring them back almost immediately, making for a novel playstyle