Originally Posted by
Xiphias
Armor seems to persist and/or stack. When watching the Fireside Duel, there is one point where the Druid attacks the Warlock directly (and thus takes no return damage), leaving his Armor intact for a couple more turns before it's damaged by one of the Warlock's spells. He doesn't cast Shapeshift again within that time, but I see no reason for "+1 Armor" to not give you 1 Armor. The "+1 Attack this turn" specifies that it's this turn, and anything else that says "+X" will stack.
The only thing that doesn't seem to stack is "Restore X Health" since "restore" is a special keyword that means that it can't restore above the maximum. After all, casting a healing spell shouldn't make someone tougher than they were originally if it's an ordinary healing spell.