■ You may only cast this card if an item on your field has eight or more «Plague» spells in its soul. ■ [Cast Cost] [Pay 6 gauge] ■ Flip your opponent's flag face down. (When a flag is face down, cards written on that flag cannot be used, and all cards on that field is put into the drop zone!)
Q2368: Is it possible to "Belost" if your flag is face-down by the ability of "Ultimate Great Spell, World Pandemic!".
A: Yes, you can. Since it can be used with all flags, the information of "Lost World" is not lost when the flag is face-down. In the case of "Belost" on a face-down flag, the flag selected by "Belost" has no information, so there is no ability to get. (For example: When put on top of a face-down "Dragon World", you can use ‹Lost World› cards, and cannot use ‹Dragon World› or ‹Generic› cards.)
Q2369: What happens when "Lost World" is flipped face-down by "Ultimate Great Spell, World Pandemic!"
A: Because the information of "Lost World" is lost, you cannot use ‹Lost World› cards, nor the cards written on the flag chosen by "Belost".