Carydan, Heir to the Throne

Hero of the Realm (This creature's name can't be changed.)
As long as you control a Plains, Carydan gets
+1/+1 and has lifelink.
As long as you control a Island, Carydan gets
+0/+1 and has flying.
As long as you control a Forest, Carydan gets
+1/+0 and has trample.
From one border to the other we shall draw our forced
and use what they bring to the round table.