When Elven Ruins enters the battlefield, sacrifice it unless you pay .
: Add or to your mana pool.
Put Elven Ruins on top of your library: Add to your mana pool.
, Sacrifice Elven Ruins: Target creature gets +2/+2 until end of turn.
.
: Add or 
to your mana pool.
to your mana pool. , Sacrifice Elven Ruins: Target creature gets +2/+2 until end of turn.
