Talk:Ultimate Great Spell, World Pandemic!/@comment-4873205-20171229110552/@comment-25600444-20171229110925

That I do not know specifically.

I want to say yes

BUT

Since your flag is flipped face down, per the rules I remember when it comes to using non-native cards in your deck (Excluding Omni Lords), all non-native card info is blank, so any and all effects prior to the spell are gone.

Hence you lose Soulguard.