While N is usually 1 or 2, there are cards with toxic 6 and even 9, so beware: if you get 10 poison counters or more, you're dead no matter how high your healt may be
You also need to make sure you hit your land drops, either with draw effects (Qiqirn Merchant and Adventurers Airship provide usable bodies as well as draw smoothing) or cards that directly give you lands or mana (World Map, landcyclers, Blitzball)
Of course, since youd be playing black, cycling all these creatures into the graveyard gives you plenty of reanimation options, such as Reanimate, Victimize, and even Rise of the Dark Realms
Rapunzel, Letting Her Hair Down has Tangle (each opponent loses one lore) as hers
I've been a huge fan of both since I was a child, so when I first heard that we might get an opportunity to work with SQUARE ENIX to make a FINAL FANTASY product, I was quick to volunteer my expertise