
For only 3 mana that is pretty good, especially when serving as a creature in control builds. If you happen to cast Ruinous Path or Planar Outburst with their alternate Awaken costs, you can put 4 +1/+1 counters on the Vent and really create some huge life differentials in a hurry. It doesn’t sound exciting, but Shambling Vent should prove to be very playable in decks that don’t necessarily care about their lands coming into play tapped - Esper Control, for example. This is a pretty good land, even if it’s far from being the best creature land ever printed.