That isn't a mono deck, as it isn't 100% GHEIST (Eyrik is a leader).
The only advice that I could really give you is drop some of those high-starred cards for lower-starred cards, like Arkn or Leviatonn.
Here how bout this
Toro Platinum Bristone XU-52 Z3r0 D34d Akrin Methane now the last card should either be Astrid or Mini Mund
Yeah but she is still a bit pricey but if u goy the money