Dragon Nest

Dragon Nest enters the battlefield tapped.
{t}: Add one mana of any color to your mana
pool. Spend this mana only to cast a dragon spell.
{7}, {t}: Sacrifice Dragon Nest, You get an
emblem with "At the beginning of your upkeep
create a 2/2 dragon creature token with flying.
Then you may pay {5}, if you do return Dragon
Nest from your graveyard to your hand."