Item concepts for Mages/AP champions?

Rites of Desolation 80 AP 10% CDR Unique Passive - killing or assisting Epic monsters and enemy champions refund 2 seconds on basic abilies and 5 seconds on ultimate abilities

DeathFire Grasp 100 AP 10% CDR Unique Passive - AA and Abilities deal 25% of your AP as bonus magic damage to enemies bellow 50% Max HP, the damage is separated on every tick of DoT abilities to add up to a total of 25% of your AP

Chrono Gem 75 AP 20% CDR 50% mana regen Unique Passive - every 10 Seconds refund 1 second on all abilities

Magus Shield 60 AP 40 AR Unique Passive - while out of combat get 5 AR per second up to 20 AR, lose bonus AR after taking physical damage and this Passive goes on a 40 second CD

Stone of Binding 40 AP 30 AR 30 MR Unique Passive - enemies hit by Hard CC take 15% increased damage from all sources for 3 seconds

What do you all think? And if you are gonna downvote then please find the courage to post a comment that would explain why first