on my mosaic sin.
would the life tap be useful ?
trying to make myself tankier ...

No

tankiness for a mosaic sin is achieved by killing 4 screens full of monsters in one single series of kicks

claw block + fade makes you second tankiest char in the game next to zon. plus you fhr lock/kill all the monsters almost instantly when you attack, and you heal to full on every attack. dracs would be completely redundant