(Peat Gate isn't a spell.)
At the beginning of your end step, if you didn't cast any spells this turn, Peat Gate deals 1 damage to you.
All creatures have Mountainwalk.
: Add or to your mana pool.
Sacrifice Peat Gate: Add or to your mana pool.
: Add 
or 
to your mana pool. or to your mana pool.
