Droll & Lock Bird and Unchained Soul Lord of Yama

Under Droll & Lock Bird, you may still activate Unchained Soul Lord of Yama's on-Summon effect even if you do not currently have an `"Unchained"` monster in your GY.

The reason is that Yama's effect can add an `"Unchained"` monster from the Deck or GY to the hand. Droll blocks the Deck option, but activation legality is not judged only by the exact GY state at that instant if the chain can still change before Yama resolves.

The relevant text

Unchained Soul Lord of Yama - "If this card is Special Summoned: You can add 1 "Unchained" monster from your Deck or GY to your hand."

Droll & Lock Bird - "If a card(s) is added from the Main Deck to your opponent's hand, except during the Draw Phase (Quick Effect): You can send this card from your hand to the GY; for the rest of this turn, cards cannot be added from either player's Main Deck to the hand."

The "except during the Draw Phase" carve-out is part of Droll's trigger condition only. Droll's applied (lingering) effect has no draw exception: once it resolves it blocks every add from the Main Deck to the hand for the rest of the turn, including drawing, because drawing a card is itself adding that card from the Main Deck to the hand.

Why the activation is legal

When Yama's Trigger Effect is activated under Droll, the game asks whether there is a way for that effect to resolve legally.

Because Yama can add from the GY as an alternative to adding from the Deck, the effect is still activatable if it is possible for an `"Unchained"` monster to reach your GY before Yama resolves, such as by the resolution of a higher Chain Link.

So even if your GY contains no `"Unchained"` monster at activation time, you may still activate Yama's effect under Droll if the chain could make the GY option legal by the time Yama resolves.

What happens on resolution

• If an `"Unchained"` monster is in your GY when Yama resolves, Yama can add that monster from the GY to your hand.
• If no `"Unchained"` monster is in your GY when Yama resolves, Yama cannot add from the Deck because of Droll, and the effect resolves without adding a card.

Worked example

"I Link Summon Unchained Soul Lord of Yama while Droll & Lock Bird is already applying. I currently have no 'Unchained' monsters in my GY, but Chain Link 2 will send one there. Can I still activate Yama as Chain Link 1?"

- Answer: Yes. Yama may still be activated because it is possible for the effect to resolve legally using the GY part of the effect after the higher Chain Link resolves.

"What if nothing puts an 'Unchained' monster in my GY before Yama resolves?"

- Answer: Then Yama resolves without adding. Droll still prevents adding from the Deck, and the GY option is still unavailable at resolution.

Judge calls to watch for

• This ruling turns on resolution viability, not just the board state at activation.
• For Yama, Droll shuts off the Deck-to-hand branch but does not erase Yama's separate GY-to-hand option (Yama adds, it does not draw).
• The important check is the game state when Yama resolves. If the GY branch becomes legal before then, the effect can succeed through that branch.
• Drawing counts. Droll's lingering "cannot be added from the Main Deck to the hand" includes drawing, so while Droll's effect is active a draw effect cannot draw — e.g. a "shuffle, then draw cards equal to the number shuffled" effect would shuffle but draw nothing, and a "draw 2" effect adds no cards. Never rule that drawing is exempt from Droll's applied effect; the only draw exception is in Droll's trigger condition.

Sources

• card text of Unchained Soul Lord of Yama and Droll & Lock Bird
• activation-legality principle for effects with multiple legal resolution branches