Tengu format ruling
Pitch-Black Power Stone

Card effect (current official text)Activate this card by placing 3 Spell Counters on it. Once per turn, during your turn: You can target 1 other face-up card on the field that you can place a Spell Counter on; remove 1 Spell Counter from this card, and if you do, place 1 Spell Counter on that target. When the last Spell Counter(s) is removed from this card, destroy it.
Rulings
- You place the 3 Spell Counters on Pitch-Black Power Stone even if Royal Decree is active, so if your opponent chains Royal Decree to your Pitch-Black Power Stone, or chains Call of the Haunted to Special Summon Jinzo, you still get 3 Spell Counters on it.
- Pitch-Black Power Stone's transfer effect targets.
- Pitch-Black Power Stone may itself receive additional Spell Counters from effects such as Apprentice Magician.
- You can use a Spell Counter from a card like Breaker the Magical Warrior and replace Breaker the Magical Warrior's Spell Counter with Pitch-Black Power Stone on the same turn (and use Breaker the Magical Warrior's effect again that same turn, if you wish).
- If you have multiple Pitch-Black Power Stones, each can transfer 1 of its Spell Counters per turn.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.