Un'Saraaj

Suspend 10—{u}{b}{r}{g}
Sacrifice an artifact, creature, or land: Remove a
time counter from Un'Saraaj. Activate this ability
only if Un'Saraaj is suspended.
When the last time counter is removed from
Un'Saraaj while it's exiled, put all creatures from
your library onto the battlefield. Those creatures
gain haste until end of turn.