Making the ability attached to the minion makes Variax unplayable due to the extreme tempo loss. Spending 8 mana to play a single minion is a huge tempo loss already, as you don’t develop your board much or remove any of your opponent’s threats at all, plus the next turn you’re likely to just drop 2 5/5’s, again not dealing with your opponent’s board whatsoever. This is balanced out by your Awesome BBS having infinite value. If you spend 8 mana to drop a single body only to have it removed by any number of 1-3 mana spells the next turn, you’ve just lost the game, since your opponent essentially got 2 free turns to develop their board or just straight up kill you. It makes Variax useless.
Making the BBS cost more doesn’t have much of a point. In the lategame you just play your BBS only most of the time anyways. If you make it cost more, 2 5/5’s just aren’t worth the mana, it’d be better to just play cards from your hand. And if your BBS isn’t worth it, why play Variax to get that BBS at all?
What did I mean by already losing? If Variax gets out and you don’t have the board control to put your opponent in a serious predicament (forcing them to deal with you instead of swarming awesome wraithlings) then you were going to lose the game anyways, Variax or not. What this means is even without Variax, Spectral Revenant would’ve likely ended the game anyways, or some combo of swarm or deathwatch minions or any other big threat. Variax is generally effective when you’re already winning the game.
What did I mean by no wincon? Every single win condition in the game can be played by the time Variax comes out. Every single one. And most can be played a good 1-4 mana before that, or even multiple times. If your opponent’s win condition is Variax and they slap it down before you’ve played your win condition, you’re either spending the whole game responding to their board (aka losing the game and playing no threats) or you just don’t have a win condition. Your opponent playing Variax will give you a chance to lock down the board 10/10 times in an even matchup. You have 2 turns after Variax is played to take control of the board and play your win condition, if you haven’t already.
If you have no win condition, that means you play an extremely control oriented deck that just wins by outlasting your opponent, and that’s exactly the kind of deck Variax is designed to beat. Therefore, if you’re having trouble with Variax, make your deck a little more dangerous and a little less boring. I played control Lyonar to S rank and didn’t lose to Variax once, because every time they played it I was able to surround them and threaten lethal next turn.