In a block focused on gold spells, it only makes sense that players would have multiple land types in play, so a cycle of mechanics playing off that was a no-brainer
The combination of seeing five cards and drawing two is surprisingly potent, especially in formats that have good ramp (Sol Ring, Ancient Tomb) and where the power level between cards varies greatly (singleton formats, Vintage)
Yes, mentor does stack
The absence of Trainer abilities in-game contributes toward the appeal of training up teams of Pokmon, and optimizing their movesets for the challenges offered by Gym Leaders and Trainers
Planeswalkers can protect themselves in several ways: by removing opposing creatures, by generating creature tokens that can serve as blockers, or by having a high starting loyalty that will allow them to survive an attack
Update (April 19): Outlaws of Thunder Junction is now available to purchase at your local games store and online