Golden rhino

When golden rhino enters, you add 3 mana
of any color.

Whenever you cast a creature spell, reveal the
top card of your library, if it's a permanent
card you may pay life equal to it's mana value,
if you do put it onto the battlefield. If it's not
a permanent card you may pay life equal to
it's mana value, if you do put a creature card
from your hand onto the battlefield tapped.