Eikar Tur, The One

Vigilance, Of The Three
This creature cannot be blocked by other Of
The Three creatures
Whenever a Choir enters the battlefield, put
+1/+1 counters on any choir equal to its mana
value
Whenever an elemental leaves the battlefield, all
choir creature cards gain flying and hexproof
Choirs cost {1} less to cast
Elementals cost {1} more to cast