There are many scenarios where a creature enchanted by Pretenders Claim will either A) be blocked and have the tapping lands ability not matter, B) just be outright killed, or C) connect because the opponent wasnt going to block anyhow
Common Courtesy is an enchantment that's another one of the couple of counterspell cards in this set
Worldgorger Dragon goes to the graveyard, triggering the return of exiled cards
Storm is already a powerful strategy, and Prismari makes it even scarier by turning your instants and sorceries into Storm cards
Only by looking at the decklist and seeing things like Arcane Melee might you realize that this was intended to be a politically minded control deck, aka Group Slug
Whenever a Warrior attacks, you may have its controller create a 1/1 white Warrior creature token thats tapped and attacking. Thats good as it is, but it gets better