When Outpost Caves enters the battlefield, sacrifice it unless you pay .
: Add to your mana pool. Return Outpost Caves to its owner's hand.
: Outpost Caves becomes a 2/1 white and black Angel Knight creature until end of turn. It's still a land.
.
: Add 
to your mana pool. Return Outpost Caves to its owner's hand.: Outpost Caves becomes a 2/1 white and black Angel Knight creature until end of turn. It's still a land.
