These aren't just reskins either, they're brand-new mechanics designed specifically for this crossover
If youre playing a decent chunk of instants or sorceries and are going wide, this spell creates backbreaking turns that either win you the game or put you so far ahead that winning becomes near inevitable
It has to be FREE You cannot gain financial or information for the fan content (your proxy) It must be Free for others (including Wizards) to view, access, share and use without requiring paying you, obtaining your approval or giving you credit
You can, however, pay additional costs, such as teamwork costs
While on the surface, they dont look all too similar, they both cost 5 mana or have mana value of 5
When Massacre Wurm enters, creatures your opponents control get -2/-2 until end of turn