Like most Pokmon cards, the value of Giratina-EX depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Ancient Origins)
The typo in Drowzee's name, perhaps not so much
The Elder Dragon War Pyroclasm effects usually cost 3
The Showcase versions, however, did make up for lost value and have maintained their worth heading into the March of the Machine release
Many longtime players now say Invoke Prejudice is a nasty reminder that Magics early expansions didnt get a thorough review and some magic artists had disturbing personal beliefs
According to DCI-distributed tournament primers, Timeshifted cards are tournament legal wherever the main set is