I forgot all about Night's Whisper you're right it's much better here Underworld Connections is also and option. Also you could side board Banishing Light, Mortify, or Revoke Existence for artifact and enchantment removal just in case.
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I like how you think. Also you could consider scry the bones, sign in blood, or dark prophecy for some draw.
I too love hydras. You should get a Nykthos shrine to nyx for this deck.
Ephara and Karametra the enablers of civilization.
That combo is sick I love it.
Guarantees always having the right color mana. It also gives a mana itself.
I think this may be the most obnoxious deck i`ve ever seen I love it.
I didn't even think of those.
Oblivion Ring disagrees. But you're right it does lack late game perhaps he is banking on it being over fast.
Howlgeist is good here but a bit mana costly for what you get in my opinion.
If he's worried about kill cards he could use Alpha Authority. or Full Moon's Rise.
No Moonmist doesn't target anything.
Remember every time you play a rat to scream Rattata I choose you.