Use Helm of underworld king to block this (graveyard shop), or get Supreme and 100k+ HP with good regeneration Quote Dingo
I know he has a spell block ability that kills the caster instantly when they target him
Not anymore, now he add more and more spell damage with each hit (before there was 2 breakpoints: less then 50% max HP and less then 200k HP). There was some more ability changes and you can see all in Changelog. Quote Dingo
and I know that he goes super Saiyan when he is halfway dead and kills you almost instantly
In HOTE version 1.23b and few versions before it was possible to reduce Michel's damage to the point when you can tank him forever with Trained Horses at city fountain. This was possible even in singleplayer games and thats why his abilities are changed.