There're several consumables, that add boni for the next 5 Tarot missions, yet the usage is restricted to a single type - once you consume it, other types are unavailable for the next 5 missions.

That does not seem reasonable - every type should be available simultaniously. The boni provided are definitely not OP,  the comsumables are not cheap, on top of that the Additional Allowed Death is not particularly useful during the Crusades.