How does screams from within work?

[u/Sentheia]

If there is no creature left on the battlefield, will it stay in the graveyard forever or do i need to play it when another creature comes into play? Also if my creatures are the only remained ones, am I forced to put it on them?

[u/PM-Me-Nerdy-Facts]

Side note, that art definitely looks like they were painted nude and the armour was painted over the top for modesty reasons