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Seems nice
I think that chant of rage is a little too conditional to take 3, perhaps trading one for Lullaby will be more effective.
I've never seen a meditation amulet used without a spawnpoint. What do you plan to do with so much mana and so few actions?
Chant of Rage is amazing. Siren's Call does fulfill a similar role in some situations, but I think the point here is to get everything into the Kraken's zone and eat it all. Water Elemental will push what can't be called/chanted and Naiya can be your support spell battery while you give the Kraken melee +2 using Siren's Call. I'm not sure that the Meditation Amulet is worth it either, but there's no harm in trying.
The Med Amulet is mainly used for getting that extra mana each turn.
T1: Nayia sea
T2 if not rushed
Med Amulet mediate, nayia casts whatever I need
If rushed
Levithan armor, ballad of courage/whatever defenses I need
T3: Nayia casts sea, i med and do whatever
t4: bring out one of the baddies
Will answer more in depth later