Koyanagi, Kenin of the Doji's

At the start of your upkeep roll a d6, and then surveil 3. If the dice result was a 3, surveil 6 instead.
Whenever you roll a d6, make a 1/1 blue bird
with flying.
When Koyanagi attacks, if there is another
spirit on the battlefield, transform Koyanagi.
"...And that's when she listened through the door
and heard the strangest sound..."