Forbidding Crater enters the battlefield tapped unless you pay .
: Add or to your mana pool.
Put Forbidding Crater on top of your library: Add to your mana pool.
, : Target Knight gets +1/+1 until end of turn.
.
: Add 
or to your mana pool.
to your mana pool. , : Target Knight gets +1/+1 until end of turn.
