When Grass-Bank enters the battlefield, sacrifice it unless you pay .
: Add or to your mana pool.
Sacrifice Grass-Bank: Add or to your mana pool.
: Target 1/1 creature gets +1/+0 until end of turn.
.
: Add or 
to your mana pool. or to your mana pool.: Target 1/1 creature gets +1/+0 until end of turn.
