Takeo's Rage

Enchant player
Enchanted player is cursed.
When Takeo's Rage enters the battlefield, tap
target creature cursed player controls, it doesn't
untap during its controller's untap step.
At the beginning of cursed player's turn, they
lose life equal to tapped creature's power.
If a spell would target Takeo's Rage, its controller sacrifices tapped creature.
"He was so sick. He even killed the kid's cat."
—Miyuki Nazawa