My current variation of Hostage Mage! 64% winrate after 90 matches.
What differs this version from the rest is that:

1) It doesnt run the Rogue cards for drawing, this is to avoid running the tourist brick.

2) It has Fizzle! New cool tech for Hostage Mages now that its effect is Once per Game! This means Rommath wont recast the screenshot and fill your hand with garbage when you actually wanted him to potion himself back to hand! i’ve used fizzle to win the hard disruption matchups like Shudderwock Shaman or Reno Warrior by screenshotting Rommath as a fail-save so if he gets dirty ratted or mutanus’ed you can find him later in the screenshot. It also works great to screenshot a hand full of stall spells!

3) It runs both the new Ysera and Xavius from Emerald Dream! Ysera is imo a better Audio Amplifier since its effect is 100% consistent through all your games unlike Amplifier where if you dont draw him or play him you dont get that 1 extra mana and handspace.
Since you stall so much you can consistently get to turn 15 and Ysera can be played on t9 with an ice block or frozen nova right after to ramp 3!
Xavius is there to help search for Rommath, tho he ended up being much more helpful to build tempo in the early game after playing him on t3 or t4 and getting a +4/+5 Eredar Brute for example. It has his highrolls but the lowrolls are still “discover a minion from deck” so… really good! haha

Notes: As for draw enginges, I’ve tried Coldlight Oracle and Research Proyect to mill cards while i draw but it works horribly against Shaggro and Research being a spell is really bad for your Rommath, i experimented with Card Grader but ultimately since you play a REALLY slow deck Overplanner works better, Prize Vendor could be replaced by any other draw minion but since its a 2 mana draw 2 i found it very helpful.
Finally, Eredar Brute is AMAZING against Shaggro, if you can wait to play him with a frost nova it wins you the match by itself.

Deck Guide: (For anyone who doesnt know how to play Hostage Mage)
Step 1: Mulligan for draw cards like Volume-Up, Prize Vendor, Overplanner. Shield Battery isnt the worst to keep so you can have sth to play on 2, same with Ice Block. Against aggro matchups keep all defensive spells and even dawngrasp could be kept, but never mulligan away your Volume-up! Against Combo decks keep Ice Block and Dirty Rat.

If you get Volume-up you try to play a card that doesnt draw you more cards before playing it so you dont overdraw. If you have coin you want to play Shield Battery or Dirty Rat on 2 into coin > Volume-Up on 3, if you dont have coin you wanna play anything on t2 or t3 like an iceblock for example and Volume-Up on t4.

Step 2: Play from t4-5 with stall spells such as frozen nova or Solid Alibi to stall while you draw and get more mana crystals as the turns progress. You gotta think how to stay alive the most turns possible!

Step 3: Eventually you want to play a copied Potion of Illusion or the one on your ETC. This will make it so when you play Rommath he bounces itself to hand costing 1 mana.

Step 4: Find and play Rommath who should recast Potion of Illusion and a stall spell or Lightshow (your offensive spell in the ETC), if you play him a bunch of times with Lightshow you deal a bunch of damage and win, if you get to play a copied Iceblock for Rommath to recast you win against anyone who doesnt have secret tech against you. If Rommath can recast a copied Shield Battery and Solid Alibi then you become inmortal! And if you only have Potion of Illusion you can bounce the Skaters to gain armor or your Ceaseless Expanse to control board, the sky is the limit!