Ryze is a high damage mage with high scaling and the unique ability to teleport himself and/or allies a distance away. He's known for building a lot of mana and prioritizing Cooldown Reduction so that he can spam his spells and do anti-fun amounts of damage. Still, even with these capabilities he has weaknesses, as do most champions that were released in the age of yore (See seasons 1-2) and we'll explore these today
Passive – Arcane Mastery
Ryze's spells deal extra damage based on his Bonus Mana, and he gains a percentage increase to his maximum Mana based on his Ability Power.
Q – Overload
Passively, Ryze's other damaging spells reset Overload and begin to charge a Rune that can be used to empower Overload.
On cast, Ryze throws a charge of pure energy in a line, dealing damage to the first enemy struck. If a Rune is fully charged, Ryze also gains a shield and Movement Speed.
W – Rune Prison
Ryze traps a target enemy unit in a cage of runes, damaging them and preventing them from moving.
E – Spell Flux
Ryze releases an orb of pure magical power that damages an enemy and debuffs them. Ryze's spells have additional effects against the debuffed enemy.
R – Realm Warp
Ryze creates a portal to a nearby location. After a few seconds, allies standing near the portal are teleported to the target location.
Ryze's spell ranges are low on everything except his skill shot Q. If you outrange him, abuse that, if not, just stay out of his circle of death, and he can't pressure you.
Ryze tends to be really good at one on one duels. Don't be afraid to avoid chancing a death by backing off from a fight.
Ryze can teleport. If you don't see him, be very careful, he can appear very quickly, and not alone.
Ryze will typically prioritize building mana early, do not mistake this as him having no combat stats, as his passive causes his mana to increase his damage.
Ryze is reliant on having a large mana pool, and he doesn't early, so you can punish him for overtaxing it.
Xerath just outranges him and can punish him really hard for being short ranged, will remaining out of the range of any sort of threat, beyond a ult in, which would only really work if the Xerath was overextended
Ryze doesn't push well early and Ziggs does, just push him under his tower, force him to miss farm and/or burn his mana pool on trying to pick up CS and develop a healthy lead over him.
The same as Xerath, but with more enthusiasm and cool puns about light.
Build Magic Resist and buy wards to keep an eye on him if he tries to teleport people in. That's really the best anyone can hope for when itemizing against Ryze. AD Carries can pick up a rapid fire cannon to help stay out of his range, but even that is only a periodic crutch, and they may be better of making sure they have a QSS for the MR and Rune Prison, or a Hexdrinker.