(Madblind Oasis isn't a spell.)
Madblind Oasis enters the battlefield tapped unless you pay .
, : Look at target player's hand.
: Add to your mana pool.
: Add or to your mana pool. Each opponent gains 1 life.
., 
: Look at target player's hand.: Add to your mana pool.: Add 
or 
to your mana pool. Each opponent gains 1 life.
