Concrete Bunker

Cast Zone - Any card can be placed here from your
hand during your turn (this doesn't count as casting
the card.) You play those cards or cast them from
here as you would from your hand. If a Cast Zone is
destroyed, all cards in it are destroyed. If a Cast
Zone is otherwise removed from the battlefield, put
all cards in it into your hand.
Max Storage 3 (Up to 3 cards can be in this cast
zone at any time.)
Creature spells cast from here can't be countered.