No offense but this is the most underpowered card I have ever seen on this forum. Period.
High cost, almost useless effect.
Changing a Pillar to a mark has only one advantage - mark is indestructible. Why would anyone use this card when they can simply take Protect Artifact and protect all their Pillars? EDIT: seems like this was already pointed out
And like with other ideas.. I don't like when that image is used as a spell. Doesn't look anything like a spell, and looks exactly like a permanent.