Considering how many great options we have for countermagic Counterspell, Swan Song, Negate, Disdainful Stroke, and so on it's hard to see me ever wanting to go for Out of Bounds, even though it's an alright card
Though he technically only has one loyalty ability, there are four possible outcomes here depending on your luck
resolve one cascade trigger and the spell you cast from it before resolving the next cascade trigger.
Since Kenrith still costs a little over a dollar, he definitely makes up for one awesome budget MtG Commander
There are large creatures in Commander and some of them will want to come your way
Spectacular Specters, on the other hand, features a larger number of the new Whispers and therefore is designed to exploit their Boost mechanics to the fullest