(: Add or to your mana pool.)
At the beginning of your end step, if you didn't cast any spells this turn, Unstable Tower deals 1 damage to you.
, Sacrifice Unstable Tower: Unstable Tower deals 1 damage to target creature or player.
: Add 
or 
to your mana pool.), Sacrifice Unstable Tower: Unstable Tower deals 1 damage to target creature or player.
