We want to deliver fans the best, coolest Spider-Man stuff and not overwhelm it with things we added just to hit set size
Although we have yet to see any cards with the defender ability from Dragonstorm, its often added to wall-type creatures who have some amount of toughness but zero power, making them pesky blockers but hardly win conditions
On top of that , you get to choose a background to pair with Baeloth
Relying on what others may have is always risky and should rarely be your main strategy
Rather, this ability is useful to both add a defender to block with to keep Xenagos around, while simultaneously boosting the efficacy of his first ability
That means your opponents cannot swing at you with creatures, or target you with any spells until your next turn, and this is potentially a lifesaver