Kagachi, Bane of Kings

Kagachi, Bane of Kings has flash as long as
an opponent has a commander in the command
zone.
{1}{r}: Kagachi, Bane of Kings gets +1/+0 until
end of turn for each legendary creature on the battlefield.
Shuriken 3 (When this creature enters the battlefield, it deals up to 3 damage to any number of targets.)