Croalt Roach

Sacrifice a curse: Draw a card
At the start of your upkeep, you may play a curse from your hand onto the battlefield with converted
mana cost equal to or lower than the number of
curses your control.
"I'd say it's up to you. He's an unapologetic snake,
but if you don't give a reason to stab you in the back... he might just be the reason you don't die."
- Dragor, Thief of Xanathar