When Glorifier of Suffering enters, you may sacrifice another creature or artifact. When you do, put a +1/+1 counter on each of up to two target creatures.
"Everyone wants to be remembered. Few are willing to do what it takes."
You don't choose a target for Glorifier of Suffering's ability at the time it triggers. Rather, a second "reflexive" ability triggers when you sacrifice another creature or artifact this way. You choose targets for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.
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.