Lane sustain, harassment, and domination.
Creative tools and rule bending
Your first 2 attacks after using an ability on champions grants gold and sometimes consumables.
You get free boots at 10 min. but you cannot buy boots before then. These boots give additional MS. For each takedown you acquire the boots 30s sooner.
Get a free biscuit every 3 minutes, until 12 minutes. Biscuits heal and permanently increase your max mana.
+5% CDR +5% Max CDR +5% Summoner Spell CDR +5% Item CDR
Empowered abilities and resource manipulation
Hitting enemy champions with a spell grants maximum mana.
After reaching 250 mana, Manaflow Band restores 1% of your missing mana every 5 seconds.
Gain 10% CDR when you reach level 10. Excess CDR becomes AP or AD, Adaptive.
Offense
+5 AD or 9 AP
Flex
Defense
+6 Armor or 8 MR (match-up)
Viktor is easily able to repeatedly proc Klepto with [Q] spam and melee harassment in lane.
The raw gold value of Magical Footwear allows you to hit your mid-game powerspike with a strong item lead.
Biscuit Delivery paired with Time War Tonic grants you insane lane sustain so you can repeatedly take trades with [Q].
Cosmic Insight's all-around utility makes it a great offensive rune choice, allowing you to get several more [Q]s and [E]s off in teamfights.
Manaflow Band's early mana sustain helps you to keep your harassment up.
Transience's mid-game CDR is great when paired with Ice Born Gauntlet so that you're able to kite through teamfights with [Q] movement speed.