Articuno, Legendary of Ice

Flying
When Articuno, Legendary of Ice enters the battlefield, freeze up to two target permanents.
(Frozen permanents are tapped, do not untap during
their controller's untap step, and lose all abilities. A
frozen permanent's controller may pay {2} at sorcery
speed to remove freeze.)

{1}{u}{u}{u}: Freeze target permanent, it gains shroud
until your next turn.