No they need to be close to each other. Ranged removal is needed in ALL factions to stop cheap keep away tactics. You should be blaming ur draw instead of cp.
On our kids hot topic of “power creep” outside faction cards shouldn’t be looked at because they have different tools and synergies. As to in faction entropic is a base card not costing spirit or having to buy. Entropic is one mana less in that 3-4 mana sweet spot lending to more combos then blood air.
With that said blood in the air is a card I can see using with my sajj deck because 5 mana isn’t my swingy turn. I’m usually stalling for my six mana gifts turn so being able to take out a minion turn 5 is nice.

(although expensive) 