When Waterveil Karoo enters the battlefield, sacrifice it unless you pay .
: Add or to your mana pool.
Put Waterveil Karoo on top of your library: Add to your mana pool.
Cycling (, Discard this card: Draw a card.)
.
: Add 
or to your mana pool.
to your mana pool. 
(, Discard this card: Draw a card.)
