Restless Anchorage [The Lost Caverns of Ixalan]

Restless Anchorage enters the battlefield tapped.
{T}: Add {W} or {U}
{1}{W}{U}: Until end of turn, Restless Anchorage becomes a 2/3 white and blue Bird creature with flying. It's still a land.
Whenever Restless Anchorage attacks, create a Map token.