Ghostfire inspired the mechanic devoid, but creatively was a mismatch as all the devoid cards represented the Eldrazi and Ghostfire represented Ugin's colorless magic
Theres plenty of swords and sorcery here, courtesy of Disneys wealth of fantasy material, but there are also cards of coconuts and songs such as Be Our Guest. If we innovate the trading card game rules, the trading card gamers get super jazzed about that, but we risk alienating folks who have never played a trading card game before, Miller says
"2002 Osamu Tezuka Cultural Prizes"
If the card was very playable in the Trading Card Game then this only made it even more valuable as people enjoy having the rarest cards to make their decks the fanciest around
Both can do plain untargetable but green also gets "untargetable by opponents' spells and abilities" while blue gets activated untargetable and auras that grant it
There are some example of advantages: cause more damages, receive less damages or remove damages