Abzan Falconer, Damning Verdict, Duskshell Crawler, and Master Chef add a super effectiveness to your strategy
One of the biggest reasons this card ranks highly is that you have a easily triggered card draw that costs you no mana, so a free sacrifice outlet like Phyrexian Altar does incredible work with your creatures: drawing and paying for spells with very little assistance
Return three snow lands you control to their owner's hand: Return Icebreaker Kraken to its owner's hand
Granted, it's at sorcery speed instead of being able to do it on someone else's turn to start off a Storm combo with a bit of a boost, but in all likelihood it's still going to do more for you in a mono-black build than a simple Dark RitualDark Ritual will, for the same mana cost
If you do, Gogo and that creature each get +2/+0 and gain haste until end of turn and attack this turn if able
The exact amount of land youll want is dictated by how high the mana costs in your deck are and also whether or not youve got reliable ramp (always have a Sol Ring) or if youve got other ways of playing your cards, such as bringing them back from the graveyard after discarding them