With Kardur, Doomscourge be patient enough to let your opponents play down some heavy hitters then you get maximum impact from the ETB that goads all opposing creatures
In most cases, any creature can be the target of a legendary equipments equip effect , but some may have other stipulations that prevent them from being attached to certain creatures
If you have a really low curve this can end up being quite the card advantage engine, but Im skeptical youll end up in a deck like that very often This can sometimes do some pretty cools stuff, especially if youre sacrificing expendable creatures to make your opponent give up something real
Of course, if all your libraries are empty, you won't have much choice
Then it returns that card to the battlefield, and attaches itself to the card again (since the card is a new object on the battlefield)
The exception to this is ongoing scheme cards