Yeah definitely Flooded Strand of it works for you, you might want to try adding a few more
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I would suggest adding at least 4 on colour fetch lands would help rid of rubbish cards on the top of your deck that you see with top and brainstorm and if you do that you might want to consider adding some shock lands. Heck you could even add scry lands
I really like it although if it was my deck i think it'd take out all of the reanimation as you only have 5 creatures and it'd run it as esper control add some banishing light and some nullify
Perilous Vault could be a good choice would get rid of some of your stuff but it's in a good mana cost to not do that aswell
what about Dream Fracture with Notion Thief and Jace Beleren with Notion Thief.
i know you're not running red but Niv-Mizzet, the Firemind would make an awesome addition to this deck with all the card draw, work really well with brainstorm.
Sine you're splashing blue and white now you could consider to run noble hierarch her exalted ability is almost useless but is a better card then elvish mystic although quite expensive, also you could run prophet of kruphix so you can create defensive elemental tokens with cathers' crusade you'll get more counters on your permanent permanents
I Don't think trample is going to be very good since you're either going to have a bunch of 1/1s with trample which is rubbish or you're going to have like 6 6/6's with trample which good don't get me wrong but i'd rather have 6 6/6's a turn earlier or give them something else which isn't trample. if you're going to be swinging with the team then they're gonna have to sacrifice they're whole board to stop them from dieing. even so you'll still win from there without trample
all of my yes!
If you take out the white sources you have your deck will be legal in modern and you don't have tri-colours to worry about plus there is only two different spells with white in the casting cost
Purphoros,God of the Forge, would be a really good enchantment both of his ability's are relevant. first you make a load of tokens doing tones of damage then you give them +1/+0 and swing for win if they're not already dead! nice deck though!
true would be hard to get there but there is mana ramp
You should consider "Sign in Blood" and "Read the Bones" for more draw power to keep casting spells and using your extort also i think "Brush With Death" plus "Crypt Ghast" have a nice combo if you're running out of spells to cast for your extort.
I really like the deck, no suggestions though sorry. Good job!