It's actually easier to block than a normal creature if your opponents dont control islands
Untapping lands allows players to tap them again for mana, while untapping creatures let them both attack and block in the same turn cycle
This change in game pace could also match the narrative beautifully (what we in the business call ludonarrative consonance): while in Amonkhet, the world was defined by living warriors pushing themselves to the limit to pass the trials of the gods, in Hour of Devastation, people are just trying to survive against an ever-growing army of killer zombies
What catches your eye with this art is the sinister nature of the wild animals alongside the equally wild and ready-to-kill person beside them
It also allows you to do a removal check more frequently, with the extra supply of fetchlands you can consider just trying to put Polymorph or Indomitable Creativity on the stack 2 or 3 turns in a row and forcing your opponent to have an answer each time
More than just allowing lands to tap for any color, Wrenn and Realmbreaker also effectively protects themselves, which is always a potent ability