Calciform Key enters the battlefield tapped unless you pay .
: Add or to your mana pool.
Sacrifice Calciform Key: Add or to your mana pool.
, : Exile target Citizen, then return it to the battlefield under its owner's control.
.
: Add 
or 
to your mana pool. or to your mana pool.
, : Exile target Citizen, then return it to the battlefield under its owner's control.
