To identify a triggered ability, look for words relating to a specific time or condition such as "whenever", "when", or "at"
Both versions are equally rare and valuable, but the blue back, particularly in PSA 10 condition, is scarcer with only 20 known examples
YuGiOh prints a little foil mark onto the bottom corner of every card at the end of printing
Level 8 RBI 3000 is relatively high, so there are not a few scenes where the effect is good
Plus, you can always grind out your opponents with your commanders and use powerful counterspells as backup
This will cause any other white Auras attached to that creature to be put into their owners graveyard, but Flickering Ward will remain on the battlefield