Whether its being combined with cards like The Red Terror or Quest for Pure Flame, or used a bit more fairly with commanders like Kalamax, the Stormsire or Kresh the Bloodbraided, All Will Be One should be a kill-on-sight card
None of this is likely better than Wilhelt, the Rotcleaver, but this zombie warlock might be a nice way to power down that deck while still giving you fun things to do, if thats on your radar
Dimir Midrange is also quite a grindy deck by nature, which means it will naturally accrue removal spells and interaction in the graveyard over time
For example, Chief of the Foundry, Etherium Sculptor, Master of Etherium, Steel Overseer and Cranial Plating all reduce your spells or make them hit harder
A rule of thumb for valuing non tier one foreign language cards and foils is that they are only worth the amount your trade partner is willing to pay for them
its a Hermit Druid on opponents, but you get their land, and it doesnt have to be a basic