Dragon of the Tower

Encage in the Tower {2}{r}|
---------------------------------| Flying
Sorcery - Adventure |
---------------------------------| When Dragon of the
Gain control of target | Tower enters the
creature your opponent | battlefield, it deals 4
controls until end of your | damage to target
next turn, unless you | creature your
control a Dragon. It can't | opponent controls.
attack or block, and loses |
all its abilities. |