Mouth of the Sleeping Beast

Creatures you control have hexproof and extort. (Whenever you cast a spell, you may pay {w/b}. If you
do, each opponent loses 1 life and you gain life equal
to the total life lost this way).
"The mountains loomed overhead. There was a faint
light coming from the cave, an almost comforting
sight. It grew brighter until it engulfed the entrance.
My eyes went blind. I felt like I was falling, and the
next thing I knew, I was inside." -Sarkhan Vol, the
Dragonrider