I've played against Curious Obsession before. I'm not fully convinced of its power, and I don't own any anyway. Conclave Tribunal looks like a good discount removal spell, or do you find tapping your creatures too great a cost? The Memorial lands look good too for some more late game gas but I don't have any of those
Curious Obsessioon is very, very, VERY good if your deck is based on evasion. Holy ****, it's the nuts, and that +1/+1 bonus makes ALL the difference. If it's True Tempo, relying on tap and bounce and high power more than on evasion, it's a bit more questionable.