If Moonstone Eulogist and one or more creatures opponents control die at the same time, its second ability will trigger for each of those creatures opponents controlled that died.

If an effect refers to a Blood token, it means any artifact token with the subtype Blood, even if it has gained other subtypes.

You can't sacrifice a Blood token to pay multiple costs.

Some triggered abilities trigger "whenever you sacrifice a Blood token." These abilities trigger regardless of why you sacrificed that Blood token.