Hallowed Cliff enters the battlefield tapped unless you reveal a planeswalker card from your hand.
: Add or to your mana pool.
Put Hallowed Cliff on top of your library: Add to your mana pool.
, Sacrifice Hallowed Cliff: Add to your mana pool.
: Add 
or 
to your mana pool.
to your mana pool. , Sacrifice Hallowed Cliff: Add 
to your mana pool.
