Honestly, I caught the intent right off the bat, to the point of thinking if I was the necro's opponent and had a Level 1 and a Level 4 creatures that I was quite sure was going to die during the round, I would consider killing my level 1 (attack a guard, or mage with a damage barrier, or creature with the counterstrike trait) first to deny the neco the 4 mana. As I stated earlier healing is going to be important against the Necro. Deathlock might come out mid-game as a result.
Reading the wording again I can easily see the confusion though.