Evasion is a fun mechanic that was introduced with SoFr.
It only gives a small chance to avoid targeting, however. This is to keep it from competing too much with quintescence.
As it stands right now, this card will very heavily overshadow quintescence and the "immaterial" mechanic in general because it protects it from harmful effects but still leaves it open for buffs.
It would be a good idea to keep some kind of %chance on the evasion to keep it from being to OP.
Other than that, I think it would make a nice addition since it would allow evasion to be extended to non-air cards.