Nothing much to specify or elaborate here
If they have no creatures, Sunset Saboteur has no drawback, which makes removal a possible out, and no color is better at removal than Black
Commander is a 100-card format with no sideboard, and games go long
Nowhere to Run offers some removal and a way to get around both Hexproof and Ward, similar to Arcane Lighthouse but swapping Ward for Shroud
That's all for the Growing Threat precon, but be sure to check out the other guides from the Scrap Trawlers so you can budget before you buy it
In a vacuum, the card is most valuable as a Merfolk or for its progress in building one's devotion in blue, since this is a vacuum without consideration for players that intend to win primarily through The Oracle'sThe Oracle's triggered ability, but clearly the card reserves its Game Changing status due to how it is played