If any player controls no creatures, that player simply doesn’t sacrifice anything. Each other player still sacrifices a creature.
07-12-2018
wotc
As Slum Reaper’s ability resolves, first the player whose turn it is chooses a creature they control, then each other player in turn order does the same, knowing the choices made before them. Then all the chosen creatures are sacrificed at the same time.
07-12-2018
wotc
Slum Reaper may be the creature its controller sacrifices for its own ability.
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.