I don't know whether the Overkill interactions will work as people speculate. Would seem to me like a pretty big oversight if a surviving Linecracker could end the game instantly. I mean, they nerfed Reckless Experimenter for pretty much the same reason.
The Linecracker + BEEEES!!! combo requires you to have a Linecracker with more than 4 health on board at the start of your turn. (Also, Linecracker costs (7), so it cannot happen as early in the game.)
It's still a dangerous interaction that needs to be watched, but not as bad as the SN1P-SN4P thing.
I don't get it. Swipe is just better then this. Also Dire Wolf Alpha ? I mean what ends up happening is that you'll deal 8 for 5 mana. Reminds me of a card that was not being played in mage Flame Lance and this is something that requires 2 cards. The Gloop does not work you pay 4 mana and gain 5...assuming that the spell will kill the target. This card is below average unless you are desperate for a single target removal. But i mean...change my mind.
Swipe has no summoning synergy and no multiple-attack synergy. No one can change your mind if you don't see how that's important. You'll have to wait and let game play change it for you.
(Also, the Dire Wolf Alpha trick doesn't work anyway. That's not how you'd use this card.)