Hearthpwn

Mistermath's Card Ratings for Voyage to the Sunken City:

8/10

Many of the colossi can be compared to Firelands Portal (Ah, remember the days when people complained about this being strong?), and this one compares very favorably. For the same cost, you're getting a 5/5 and probably 4 3/1s when all is considered, and will have done six damage split into 3 and 3. It also has a lot of inherent synergy in hunter, having the beast tag. If a control/value based hunter comes up again, perhaps similar to the deathrattle hunter of the KFT era, this card will definitely spearhead it.

Support for Midrange/Control Beast Hunter is always welcomed.

isnt the battlecry applying to all heads, including futur spawns ?

Selective Breeder , Revive Pet gives you 5 Hydralodons cards, which can quickly get insane with heads spam lol.  ^^ . Devouring Swarm gives rush-like and also revive them for 0 mana. not to mention Emergency Maneuvers which looks like to have been designed for Hydra,  it can be an insane Kaiju for hunter :)

The battlecry would only affect the initial two spawns to my understanding. Effects like this for specific minions have been done in the past (e.g. Quartermaster) and only affect what is presently on board from the battlecry when it affects specific minions. Even if more heads are summoned from other means, the battlecry of Hydralodon would only give rush to the minions named Hydralodon Head at the time Hydralodon is played from hand.

thanks :) , indeed i think they would have phrased it "Your Hydralodon Heads have Rush." to that case 

This will be great with Houndmaster Shaw.

Houndmaster Shaw on turn 6, or get a mana discount with SI:7 Skulker for single turn combo.

So if you evolve or devolve into this or pull out from your deck or from hand or any summon spell / DR, your heads wont have rush.  It is kind of a bummer. Warlock colossal has a Battlecry also.  Which is more impactful battlecry than this one. 

I wish they had more interaction between the main head and other heads. There was this guy @chegwin on regiskillbin's video yesterday, he made this custom card, which is almost identical with this, but main head doesn't have battlecry. I think it was a better interaction than this. (Main head gains attack for each side heads)

For anyone who is wondering about the video & card: https://www.youtube.com/watch?v=8NyF1Rh9mos 

Excellent card. It immediately deals 6 damage to enemy minions which is good, you get a massive board which is good, you get resilience against many board clears which is good, and it can absolutely run away with the game if not immediately dealt with, which is good!

Its a boardclear with a boardfill. Very strong

 I don't think so, the heads get rush as a battlecry, so only the initial ones get it

you are right I thought it was a aura.