Equipment like Sword of Fire and Ice that are heavily played
Grab Your Sword is similar, albeit pricier, due to the fact that it lets you deal two damage to each opposing character in one fell swoop
These cards are available in non-foil, traditional foil, and surge foil within Collector Boosters
Necropotence is one of my favorite cards ever printed in the game, and it just got amazing new artwork by the super talented Abigail Larson that rivals the original Mark Tedin piece
Blitzball Captain At the beginning of your end step, if a counter was put on Wakka this turn, put a +1/+1 counter on each other creature you control
When you combine this with mono-black decks never hurting for mana thanks to their depth of ritual and mana doubling effects, I do think the cost is something players could work around