Mini-Ryze update (Kindred/Rek'Sai level)

Since you've been doing some good work with champions who are almost there, like Rek'Sai and Kindred, I thought it might be cool if you did something about the champion you've been struggling most to get right. You are on a roll here, and I believe that you can do it. Some tinkering around with rune/flux interactions and some tweaks to Realm Warp would be enough to put him in a great spot.

General

Cast times shortened.

Arcane Mastery

Mana from AP reduced. Ryze's damaging spells deal bonus magic damage equal to their mana costs. Ryze's basic spell costs increase by 0.5% max mana for 5 seconds on casting a spell.

Overload

Mana cost changed to 3% max mana. Base damage lowered. Mana ratio removed (see Arcane Mastery) Rune empowered casts no longer grant a shield. Rune empowered casts deal 15% bonus damage. Rune empowered casts now empower your next basic attack (with a more impactful attack animation) to deal bonus magic damage equal to overload damage in an area around your target, restoring 15% of your maximum mana and granting the MS buff if it hits a champion.

Rune Prison

Mana cost changed to 1% max mana. Mana ratio removed (see Arcane Mastery). Damage now dealt over the duration instead of instantly. Duration changed to 1.3/1.4/1.5/1.6/1.7 seconds. Target is no longer snared, but are grounded and receive a 1% slow for every unit they move away from the location they were hit at. Pierces slow resist and slow immunity. If you hit a champion in the middle of a dash, they will be stopped in place.

Spell Flux

Mana cost changed to 2% max mana. Mana ratio removed (see Arcane Mastery) Spell Flux now always spreads to units near the initial target. A chain reaction will still only occur if the bounces hit flux marked targets. Flux no longer causes bonus effects to other spells. Spell Flux gains 2.5% spell vamp against flux afflicted targets, 5% versus champions. Other spells get 5% (10% versus champions), but they consume the Flux. Restore mana equal to health restored by this effect versus champions.

Realm Warp

Ryze now chooses the location of the portal (within 500 range) with his first cast. He chooses the destination with a second cast during the 2 second delay. The portal now remains for 4 seconds. Allies can walk into it to transport to the destination. The same champion cannot travel more than once. Realm warp is no longer a channel. (New) Energy Form: After warping, allies gain 30/40/50% movement speed and are untargetable for 2 seconds.