Bloodthirsty Blade is still an incredible card and underplayed
I know in the age of 7 sets per year + commander + jumpstart releases, we're looking at like 2000-3000 new cards every year, but [[Bloodthirsty Blade]] is still just one of the best goad-cards around, especially in colours that otherwise don't goad well.
All the usual goad reasons apply:
- instead of simply removing a threat, you're basically using it to make other player's life totals go down. It's like a [[Control Magic]] in disguise.
- removes a blocker from an opponent, which makes them more likely to get attacked and easier for you to attack into them.
- as it turns threats into other player's problems, they might be forced to spend creature removal/resources on it instead of your own threats.
- in a pinch, if can act as pseudo removal, forcing your opponent's utility creatures to attack into an opponent who will just block and kill it if's a big enough problem (e.g. [[Bood Artists]] and the like), though your opponent still get's a full turn of value out of the creature.
But what makes Bloodthirsty Blade so good is that it keeps goading creatures beyond just one round. Few things feel better in EDH than watching your opponents having to deal with each others stuff, while you sit back and enjoy the show, not having to spend tempo and cards on each other beyond your initial investment.
And it's not an enchantment that falls off like most of the impetus auras, which I also DO like very much. But there's a reason [[Ghoulish Impetus]] crept up in price until the reprint. It's more or less the same card for black decks with much the same advantages.
[[Eye of Nidhogg]] also got pretty popular. But recasting it costs 3 mana. Meanwhile Bloodthirsty Blade is just a single colourless mana to re-equip.
And then it actually gives a sizable +2/+0 making it more difficult to block profitably.
And It keeps being a problem for your opponents until it itself is actually answered or you're down to 1v1 and even then you can attach it to creatures that your opponent doesn't want to attack with (e.g. a [[Kinnan, Bonder Prodigy]] and other small-ish utility commanders). Most of the time, if Bloodthirsty Blade sticks around for two turn rotations it will have provided plenty of value to you.
Edited because I misread Ghoulish Impetus.