Storm's End, Baratheon Seat

Storm's End enters the battlefield tapped.
{t}: Add {g} or {r} to your mana pool.
{r}{g},{t}: Choose one or both; Storm's End,
Baratheon Seat deals 3 damage to target creature
with flying or Storm's End, Baratheon Seat deals
3 damage to target creature without flying.
"As the gods will it. Bring on your storm, my lord -
and recall, if you do, the name of this castle."