We seriously need more magic penetration options
It feels so wrong to only have liandry, void staff and magic pen boots for actual magic penetration. I had it so often lately, that a darius, poppy or some other champ just built spirit visage and could not be killed by magic damage anymore, either their shield has low cd or they heal the same amount up too quickly, because magic restistance is so strong right now.
Liandry gives 15 magic pen, magic pen boots give 15 and void staff ignores 35% of the magic res. of the enemy, doing quick math on a poppy with 200 mr shows, how void staff ignores 70 mr + your 30 magic pen is still 100 magic res. of the enemy that works real fine. It's seriously impossible for champions like Taliyah to break through that. It also feels like magic res. boots are stronger than they should be. They counter magic damage much more than your magic pen item could do.
= Madred's Bloodrazor.
Grants, IAS, HP, AP, CDR, Eyes of Pain, 4% max HP in bonus magic damage OnHit, and-
UNIQUE passive: You heal for 20% of the magic damage you deal (6.7% on AoE effects).