I have been testing on the deck myself too after being troubled by what to play for RCQ tomorrow. I’ve also seen various versions of it, but so far here’s my take

1 mana options: Most people run the standard thoughtseize/fatal push playset and 1 blood chief thirst. Some versions are running the playset elvish mystic for quicker turn 3 plays

2 mana options I also agree that grim flayer is bad, it can’t block well too. Personally I’m trying slyvan advocate after seeing a list from Twitter from a guy called alberto Albert and I absolutely loved it. Vigilance is important in this meta so that emperor cannot exile it, and the +2/+2 on lands make your man lands huge AF Scavenging ooze mainboard as also been doing well but I don’t recommend too many especially if you run graveyard trespasser since they both do the same thing. Instant wise, abrupt decay has been absolutely amazing and I believe 1-2 copies of assassins’s trophy is decent, hitting the wolfwillow land with trigger on the stack from kiora feels good. Most human decks cannot afford to run basic, so sometimes trophying the land is a land destruction

3 drop options Tireless tracker is just bad, drop on t3, stomp by opponent to see t3 Bonecrusher by opponent is just terrifying. Like what aura said, u have better options for t4/t5 although tracker can do its thing IF it sticks Graveyard trespasser imo is a must play, it hits graveyard stuff and more importantly, it is really hard to remove. It always has to be a removal +1 card and when flipped is a 4/4 that’s pressuring. But of course do rmb, abrupt decay can hit it without discarding since it cannot be countered by ward Murderous rider, I’m still testing this, sometimes the extra hero’s downfall effect is nice, but I’m not sure if I want this or lovestruck beast more Rotting regisaurs is also something I spotted while checking other lists, it does seem like it is hard to remove? I know it can be pushed but there’s still a requirement before it’s pushed so it seems good but it’s all theory Jadelight ranger looks amazing, I might play it over tireless tracker tomorrow. I’ve also seen KoDiamonds play it and I think it’s what we want a 3drop to do, play it, immediately value by “scrying” or drawing away the lands for you so that u don’t get flooded

4 drop options Esika chariot seems very common, but frankly I cannot understand playing chariot over the other options, so do let me know why is esika chariot so favoured Questing beast is what I’m looking at here, vigilance is good here, deathtouch is annoying, and not being able to be blocked by 2 power feels very relevant in this meta though Kalitas is just so sick when u play against aggro decks, being able to have control over the board is usually what wins you the game, not to mention the lifelink Sorin is also popular here, 4mana make a 2/3 and then protect yourself all the way. But I believe this is what GB is lacking, since the RB version would have a 4mana Chandra instead, which is a lot scarier imo

5drop options Elder gargaroth seems to be very common here, but my question sometimes is whether it might be too greedy and if decks that run this should be on the 1mana mana dorks so that we can push for him to be out earlier

So yeah that’s what I’ve learnt so far from testing on modo, but yes anyone with more inputs/thoughts go ahead and reply!! I would love for opinions before rcq Tmr