I always understood this Teysa to funnel the deck towards lifegain.  If a creature hits you, it dies, so you want to get hit a lot to clear the board, but if a creature gets too big, you block with Teysa, who has procreatures.  She's already set with vigilance and procreatures to put someone on the clock.  Edge of the Divinity would be bonkers.  I like the pestilence creatures, but I'd find a way to shove lifegain and auras into the mix.  Evershrike is something I'd always want to use, and Spirit Loop would break it open.  I'd make the whole deck lifegain with control not on creatures, but stuff to stop abilities like Faith's Fetters and Arrest and Darksteel Mutation.