https://deckstats.net/decks/116466/1383691-k-rrik-life-gain-demonsThis deck is built to take advantage of K'rrik's phyrexian mana ability. To support that, the deck has a lot of life link/life gain cards to fill up the health tank, which should let us cast a lot of spells quickly.
The deck has the usual life gain win cons: Vampires,
Aetherflux Reservoir,
Sanguine Bond and
Defiant Bloodlord being the biggest threats. But that's all
smoke and mirrors to hide the real purpose of the deck.
The deck is designed to get demons into play and then win with
Liliana's Contract. There is a ton of card draw and many tutors to search up demons and
Liliana's Contract. K'rrik should allow us to play those expensive demons much faster than usual by paying life, and
Vedalken Orrery and
Emergence Zone should let us get our cards out right before our upkeep, to make it a lot harder for other players to
disrupt our plans.
The ramp is all colourless mana, because we'll be paying for black mana with life. There are also protection cards to keep K'rrik safe and lots of graveyard recursion if our demons end up in there.
The deck has 32 lands (including
Emergence Zone and
Westvale Abbey), but I think that should be enough considering how much card draw there is.