Wall creatures can attack as though they didn't have defender. Because the Runed Stalactite gives the Tree all creature types, this includes Wall so the Tree can indeed attack. Also, you don't even need the Liege or other creature for bonusing the Tree. The Runed Stalactite gives the equiped creature +1/+1 so the tree will be a 1/14 before it trades P/T with you, and a 1/21 if your life total was 20 before you switched. Also, remember that the P/T modifiers are all applied BEFORE the switching of P/T so if the creature gets +1/+0 and has a P/T switch it will equal a +0/+1 regardless of which was switched first. [Edited by Squillis on 2/Aug/12 at 10:56AM]