Warlord's Bloodlust: suggestion to fix the Tryndamere/Yasuo abuse while retaining its purpose
Make the healing percentage scale per level.
For example, from 3% at level 1 to 15% at level 18.
This makes the mastery still useful for those champions while not being abusive, and retaining its intended lategame power for all users.
Another solution would be to make it heal upon critically striking champions only, or severely reduce the effect on minions and monsters (20-25% effectiveness)