You will collect evidence as an additional cost to pay in a variety of contexts
There are very few ways to remove characters from the board in Lorcana that dont rely on damage, and unlike Magic, damage is persistent on characters between turns
In fact, I could actually see Eidolon of the Great Revel instead of Dragon Whisperer, but maybe were supposed to just let Abbot be the other two-drop
Everytime you cast a noncreature spell, you get to amass Orcs X, either creating an Orc Army token with X +1/+1 counters on it, or adding that many counters to an existing Army token
Creatures with shadow cannot be blocked except by creatures with shadow, and cannot block other creatures unless they have shadow, which fits given the nature of the Unseen world in Lord of the Rings
If you cast a Shield Sphere and Vine Trellis by turn 2, you can cast The Pride of Hull Clade on turn 3 for just 1 green mana