Sub-Zero, Ice Ninja

Ninjutsu {u}{u}
Fateseal 1, Frenzy 1, Prowess,
When Sub-Zero, Ice Ninja enters the battlefield, detain target creature; when Sub-Zero, Ice Ninja leaves play, that creature is no longer detained.
The Grandmaster of the Lin Kuei assassin clan,
Sub-Zero is a cryomancer ninja who can freeze
an enemy solid.