Sokovia

When Sokovia enters the battlefield, sacrifice it
unless you sacrifice two basic lands.
{t}: Add {c}{c}
{3}, {t}: Create a 2/1 colorless Sentry creature
token.
{8}, {t}, exile Sokovia: Destroy all nonland
permanents.
"Sokovia was a failed state long before you blew it to
hell. No. I'm here because I made a promise."