Cruel Reality

Oracle Text
Enchant player
At the beginning of enchanted player's upkeep, that player sacrifices a creature or planeswalker. If the player can't, they lose 5 life.
Card Rulings
4/18/2017 The enchanted player chooses a permanent to sacrifice from among the creatures and planeswalkers that player controls. You don’t choose which type of permanent the player has to sacrifice.
4/18/2017 The enchanted player can’t choose to lose 5 life if they have a creature or planeswalker that can be sacrificed.
1/19/2018 There are many important moments in the story, but the most crucial—called “story spotlights”—are shown on cards. These cards have the Planeswalker symbol in their text box; this symbol has no effect on gameplay. You can read more about these events in the official Magic fiction at http://www.mtgstory.com.
I know this card isn't actually "good" in most situations or decks, but it's cool, flavorful and most importantly, you can't just jam it in any deck that makes black mana so it's not gonna run me $50.