Looking at list i feel that
deflect - Should be in tier B A 3 cost give target creature untouchable an has preemptive is really good an honestly the card is underrated. Its already plenty useful in constructed so draft would only make it better.
Zuza - isn't s tier an should be in B tier at most. Card is honestly overhyped/overcomplained, You miss an you pretty much wasted a turn.
aether acolyte - should be a solid mid high C. Its a decent card in draft that can get relatively big in the long run with decent stats an low cost an a stable for cov.
Humble - should be in A tier is way so good in any situation
xi ascended - should be mid b tier. Being able to create a bunch of 6/6 flyers late game without having to exhaust an being a flyer with decent stats herse;f, she is pretty solid.
Prayer of the dragon - should be high c tier. Anytime a card lets your character survive a kill spell, cheap, an is only 1 purity is going to be at least decent/solid.
Caltrops - should be low mid B tier at most. Its great when you it hits an with combos but you gambling a lot with it when its by itself.
Flame dawn hound - isn't on the list an should be on B tier.
Paladin of flamedawn - should be top of b tier combos so well with a lot of cards.
purify - totally isn't f tier, its not that uncommon to get more than one card an if you are in a matchup where they have sleepers or exile purity you'd want to be able to deal with graveyard shenanigans an revival/adaptive ritualist an its essentially peaking at their deck to see if they had anymore. Peace of mind to know there is no more mass death or certain removal.
phase bot - should be low B tier at most its too slow most of the time. Can be useful if you have board control/ stalled out game
cta - needs to he low a tier to high b tier. Only time its not useful is if literally nothing is on the board (including command zone).
tinker is solid B tier all day. extra repeated value for cheap is always useful.
reborn - should be in mid high C tier. Its situational but getting it off on something like splitterbot has to be some of the saltiest/rage inducing things an opponent will have to go through an some of the best value swings for days.
box of wonders - is automatic A tier. flickering on a stick an is cheap and not unique is very good.
Cassial, the selfless - should be solid B tier. She is a stable in constructed, a well placed cassial can just save your squad an end games sometimes. She could almost be A tier.
champions companion - should be C tier, for draft its a decent flyer It may not have charge like ferocious flyer but it survives commando an yuanshi wrath an is a stable for 2-3oos purity overseers
intervention - should be high c tier if not low B tier i think is underrated a little, especially in draft. its 1 purity so its splashable an you can save a character if calamity is coming which apparently happens more often in draft now. Plus bouncing back cards with triggers or overcharged effects etc. can be good for extra value. Heck getting a skraar on 1hp back with full health for next turn or bouncing aunnisal sounds good to me. There is a lot of funny things you can do with the card.
blood thirsty dead - mid B tier. its a really good card it and stable but commando an lightning blast etc. deal with it easy. It be high B tier if it had 5hp instead of 4
diseased zombie - should be solid B tier if not high B. Its sleepers only real 1 drop (you're not playing scavenger on turn 1 lol) an it has an ability that can be rather annoying an can straight up kill characters before they could actually do anything. Forces the opponent to play awkwardly in the fact they have to use it so they can get some value out of it. Making them rather predictable at times. Plus its 1 purity so splash for days.
awaken - should be solid B tier, revival spells are SUPER important in draft. Being able to bring back anything back or bring a last sleeper back sooner is great value. The fact its 1purity makes it very splashable
Raise dead- Should be high B tier, I don't know how this is lower than awaken. Its almost a complete upgrade to it. Its 2 purity but 2-3p sleepers is pretty good in draft an being able to revive anything from yours or your opponents grave for the same cost is just extra range value.
fear - should be low mid B tier - it combos well an can buy you a turn, cheap an 1 purity.
Risen of avarrach - solid B tier, its a stable for sleepers an the fact it comes back in a few turns everytime is longterm value an i cheap with good stats is long term value. If you happen to have 2-3 of these in your deck in draft it can really put some pressure on if they keep coming back almost every other turn.
drag down - should be C tier, its 1 cost an 1 purity to stop a timer which is what sleepers want. It may not kill the character but feeding it to a parasite is always fun to watch.
Bury - should be at bottom C tier i guess. If you got some awakens an raise dead or last sleepers/risen of avarrach etc. it can be useful but it depends on deck. Heck its 1 purity so you can splash it for the mega unit 1 or vaisir, chained prince dream in draft or something lol. With the increase in epics an legendaries etc. it might come in handy.
engine of reincarnation - Solid B tier - being able to keep making 4.4's whenever your creature dies for 4 can be hard to beat unless you can destroy it or able to gain tempo (flyers help lol).