When Battlefield Den enters the battlefield, return a land you control to its owner's hand.
: Add or to your mana pool.
: Battlefield Den becomes a 1/1 red and white Elemental Giant creature with first strike until end of turn. It's still a land.
: Add 
or 
to your mana pool.
: Battlefield Den becomes a 1/1 red and white Elemental Giant creature with first strike until end of turn. It's still a land.
