With its mana cost of seven, hefty Ward cost, and ample evasion, Sire of Seven Deaths very much resembles Koma from earlier
the first, Growl, costs just one Colorless Energy and doesnt do any damage, but instead reduces the damage of your opponents next attack by 20 HP
You are never forced to activate mana abilities to pay costs, so if there is a mandatory additional mana cost (such as from Thalia, Guardian of Thraben), you can decline to activate mana abilities to pay for it and hence fail to cast the suspended card, leaving it in exile
The Duskmourn precons, and not just Endless Punishment at that, provide a great experience to that end
Even though the slabs are pretty nice, especially compared to PSA, BGS isnt seen as the best in the industry, so for a personal collection, Id recommend going elsewhere