MTG Salvation

Hello everyone! This is an attempt at a standard deck that has been giving me some very interesting, albeit mixed, results. I'll give a brief explanation for the cards.

• Farseek -mana ramp
  
• Avacyn's Pilgrim -mana ramp
  
• Gyre Sage -mana ramp
  
• Slitherhead -cannon fodder with a bonus
  
• Strangleroot Geist -this guy can block two things before he's gone for good :l
  
• Elusive Krasis -a stoutly three drop for blocking
  
• Cloudfin Raptor -flying defender
  
• Vampire Nighthawk -Naya aggro is scary, I need life gain
  
• Fathom Mage -nice draw power
  
• Corpsejack Menace -core card
  
• Master Biomancer -core card
  
• Rancor -trample, and less worry about a card disadvantage for buffing Master Biomancer
  
• Rapid Hybridization -works well with Slitherhead and Strangleroot Geist

I just try to bum rush to four mana as quickly as possible, but understandably, aggro decks are kind of scary. I've been testing this quite a bit on Cockatrice, and it's brought this to where it is now.

I'd like anyone's and everyone's opinions/advice for making this deck as awesome as it can be whether taking some cards out or even cracking the deck into pieces and completely pushing it into a different direction. I'm completely open to everything. Thanks in advance.

I haven't tried the deck, but here are a couple quick observations:

As good as Rancor is, given that you're playing 4x Corpsejack Menace and 3x Fathom Mage in your current deck configuration, I think you need to replace Rancor with one of the spells that adds +1/+1 counters. You're throwing away too much synergy otherwise.

Since you have access to black mana, you should probably be playing better removal than Rapid Hybridization.

Lotleth Troll would work pretty well in this deck (pitch Slitherhead to it, double counters when Corpsejack is in play).

This is where I'm sitting at currently. Pacing back and forth over some decisions though, like:

• -3x Gyre Sage
  
• -3x Rancor (as suggested)
  
• -3x Rapid Hybridization
  
• -Farseek (considering)

I would add in something from the following:

• Blessings of Nature (as suggested)
  
• Increasing Savagery (as suggested)
  
• Experiment One
  
• Lotleth Troll
  
• Dreg Mangler
  
• Bioshift
  
• Prime Speaker Zegana (feel like I'd need Reliquary Tower with her and possibly wouldn't need Fathom Mage)
  
• Ultimate Price

These choices and decisions are causing me to stop and think. Would love some suggestions!

What do you think of my creature content though?