If there are no other creatures on the battlefield when the morbid ability triggers, the ability must target Morkrut Banshee itself.
07-08-2020
wotc
Morkrut Banshee's morbid ability triggers only once, not once for each creature that has died this turn. If no creatures have died by the time it enters the battlefield, its ability won't trigger at all.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.