UB Recursion (Standard)

Disclaimer: This deck was mainly build with cards I already owned. If you have any feedback to improve it, please tell me.

This deck is all about recursion. Gisa and Geralf give all the creatures a lot of value, since they can be played multiple times. Milling ourselves can almost be considered drawing, since the goal is to have Gisa and Geralf in the game to use the graveyard as an extension of the hand.
Gravedigger is here to get Gisa and Geralf if killed by removal.
But even if G&G are not in game, the graveyard is a very important section of the game. Diregraf Colossus gets bigger the later you play it, Relentless Dead can recur stuff and takes Prized Amalgam along the ride for free.

Cryptbreaker can be used to stuff the graveyard and convert lategame lands into zombies. His second ability also grands you card advantage as soon as you have enough zombie tokens (thanks to Cryptbreaker itself, Diregraf Colossus and Dark Salvation).

Lord of the Accursed buffs everything (even the very common 2/2 Zombie is now a 3/3) and provides an alternate win condition. As soon as there are enough zombies, they can all gain menace and overrun the enemy.