Not only does he grant them vigilance, a useful ability considering how great Treefolk are on defense, but he also lets them generate two green mana each when they take advantage of that vigilance and attack
Rassle Some Updates In Thunder Junction the wanted posters are up, and the jobs are goin down
Being able to steal your opponents spells is always good, and it opens up the possibility to cast basically anything you steal since you can play them by paying life instead of mana
Its particularly strong when it comes to making enchantment tokens, such as Role tokens, or the Glimmers from the previous card
This has been talked about a little, but I dont see how this being immune to Abrupt Decay and Counterbalance (largely) is worth not playing Nimble Mongoose, Treasure Cruise, or even Tombstalker instead
An example of this is when a collector buys an entire collection, splits it up and sells the cards individually