Goat format ruling
Dark Master - Zorc

Card effect (current official text)You can Ritual Summon this card with "Contract with the Dark Master". Once per turn: You can roll a six-sided die, then destroy all monsters your opponent controls if you roll 1 or 2, destroy 1 monster your opponent controls if you roll 3, 4 or 5, or destroy all monsters you control if you roll 6.
Rulings
- Because Dark Master - Zorc's effect is a Ignition Effect, you roll the die during MP 1 or 2 of your turn only.
- If you roll a 6, Dark Master - Zorc is also destroyed.
- Q: When is the target for "Dark Master – Zorc" chosen and will the effect be considered targeting if the dice roll is 3, 4, or 5? A: You would have to choose your target during resolution. When you activate the effect of Dark Master - Zorc, you have no idea what is going to happen. Due to this, the effect cannot declare any target at activation.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Goat forum — sourced change requests get reviewed.