Obviously, it depends on your deck, but I believe players should look for reasons to play more lands, not fewer
The main and most defining of them, in my opinion, is the fact that it is a format essentially designed for multiplayer matches
Also, if you combine it with previously released cards there are new possibilities for tactics to use in the current play environment
Exquisite Blood turns lifegain from a defensive strategy to an offensive one, paying off your lifegain with tremendous bursts of burn damage, directly draining your opponents
It's not a particularly strong effect, and other cards do what it does but better, but there's a novelty in Guardian Beast