Mind slash,
bitterblossom,
all is dust,
glen elendra archmage,
decree of pain,
zealous conscripts,
unspeakable symbol, both
talisman of indulgence and dominance,
greed,
dark tutelage,
dark prophecy,
bloodthrone vampire,
blood tyrant,
ashes to ashes. I understand why you probably chose these cards but overall the price versus the
profit is not a very good trade off. I'll explain in depth for each card I just listed;
Mind slash- There are cards such as corpse trader,
disciple of phenax and playing spells such as
tormented thoughts will get what you need and clean out the enemy's hand. If sacrificing creatures is necessary then there are better cards than enchantments that could be easily destroyed.
Bitterblossom- Paying a life for a single token is not a very good trade off unless the deck is designed to do so (hence it being a tribal card made for the shadowmoor block). If token production is what you want then try looking at the TARKIR block and all the RED cards that make tokens such as
dragon fodder and
goblinslide.
All is dust- It's a tribal eldrazi card designed to destroy everything without color. BLUE,BLACK, and RED are colors that I don't see your cards profiting from if they are destroyed. I see that
butcher of malakir has a cool effect but it only works if the creatures are SACRIFICED, not obliterated in mass. Also the card itself does not
profit you in the end. If you switched it with
drown in sorrow then you would most likely still get the board wiping effect you wanted AND get to scry a card.
Glen Elendra archmage- Her persist effect is admirable but it only works once and you can't remove her -1/-1 counter because all of your cards are designed to work with +1/+1 counters instead. You should try just adding dispels and maybe even a
spell shrivel (which is like a cooler version of
cancel).
decree of pain- destroys too much (same as
all is dust). Though the -2/-2 for cycling is a decent trade off you'd be better off with selective creature destruction rather than mass removal ALL the time.
zealous conscripts- it's an expensive 3/3 creature that takes someone else's creature till the end of the turn. You'd be better off with
portent of betrayal,
act of treason and even
traitorous blood. Then you can swing with their creatures (since they'll probably have haste), and then sac them using
vampiric rites,
collateral damage or
bone splinters.
unspeakable symbol - 3 life (+) 1 counter = a bad trade. You'd be better off bouncing your RAKDOS creatures and harvesting their +1/+1 counters FROM them. This way they have their strength boost for as long as needed and then they can block again once the counter is removed.
talisman of indulgence and dominance- The
rakdos keyrune and
dimir keyrune are both better because they still give you the same mana AND they can become creatures if you need them to.
greed-
vampiric rites does the same thing for one more mana, GIVES you a life, and gives you a card. Incorporate this with your undying creatures like
geralf's messenger and then remove the +1/+1 counters to keep resetting them.
dark tutelage-
Diabolic tutor and playing
shadows of the past will help you
sift through your deck faster and as less cost to you rather than having to pay random and sometimes exorbitant costs.
dark prophecy- switch this with
vampiric rites (I know I've mentioned this card a lot only because it needs to be a staple in this deck). This way you have control over what dies and you're not paying too much life at all the wrong times.
blood tyrant- He's good and probably worth side boarding but use him in multiplayer rather than 1v1. Simply because his effect works on you too (it says players not opponents). If you switch it with
vengeful vampire then you'll have an undying creature that you can harvest +1/+1 counters off of as well. And it can fly.
ashes to ashes- switch this with both
cremate and
vile rebirth. This way you can draw a card and you can get a token out of it.
These are just my observations and opinions but it's entirely up to you how you want to play your deck. Your meta is most likely different than mine.