The flip side of the card offers the rewards associated with completing the minigame
Whispers of the Muse (T1, Ext, S, Block) A favorite in "Turbo Xerox" (a blue deck which used minimal land but a ton of cantrips to thin out the deck), Counter-Phoenix (Shard Phoenix + Forbid) and Tradewind-Awakening (put Awakening on the stack, tap all your lands for mana, untap all your lands), Whispers has what might seem like a hefty price to pay for one card but you get to do it turn after turn after turn
Uncounterable is a nice perk although not that frequently relevant
10-028LCloud of Darkness Its at the point of resolution that you may put 1 Character into the Break Zone
Each time you proliferate, you can choose any permanent that has a counter, including ones controlled by opponents
Being in black also opens this Jund commander up to some reanimation engines, which could make for huge plays with creatures that have strong ETBs like Craterhoof Behemoth