Witherbloom is rightfully expensive at a cost of six colorless, one black, and one green mana (eight total)
If you can afford the expensive four set of these (They are $1300+ for heavily played versions) then you can have the best chance of drawing one or four as well as the chance for a dreaded double-Workshop hand
On all subsequent turns, having opposing creatures die means making more Treasure tokens, which should happen often if the player is running red, the color of burn spells
That being said, [casthaven]Admiral Beckett Brass[/casthaven] is fairly weak as a commander
Culling the type and turning them all Psychic, while moving Poison to the underused Darkness typing, was among the best ideas Creatures has ever had and provides greater balance to the game as a whole, as opposed to leaving an outlier type which was created specifically to rein in a type that has never been a problem in the TCG and not once has been used to showcase its merits as something other than "the Dragon killer type" The Fairy type suffered from poor implementation since day one
Load booster packs into lanes