Thassa's Oracle in library or in exile with a croak counter. All other permanents on the battlefield. {U}{U} available.
All permanents on the battlefield.
All permanents on the battlefield. Timesteam Navigator does not have summoning sickness. You have the city's blessing. {U}{U}{U} available each turn.
All permanents on the battlefield. Skullbriar has a croak counter on it. {B} or {G} available.