Xumuc Shaman -1 weakening

Xumuc Shaman is a card unknown to practically all players. It doesn't appear particularly dangerous and is very often ignored as a target. However, just 1-3 effects -X/-X played in one round routinely create a surprising front of 6+ attack units that immediately end the game.

There are 22 cards with either Decay or -X/-X type effects in the deck. They are unimpressive and stall the game until I draw a Xumuc. As the weakening effects are typically not sufficient to stem the tide beyond the first 4-5 rounds I had to add a few hard removals. There are better removals that drive the core combo such as Nullblade (does this trigger Xumuc?), Shrivel or Devouring Shadow.

I added a side theme of creature removal from the deck consisting of 4 Fallen Oni, and one Eremot, the Gathering Dark and The Unforgiven each. The idea was to thin out the number of units as the -X/-X weakening was often not enough as threat removal.

The deck could need a few more accelerators, both to stabilize the power curve and to draw Xumuc more reliably.
Proposals welcome.