Board Thread:League of Legends discussion/@comment-15077371-20140707141743

30% cooldown
+ 15% crit striker chance 100 bonus armor 400 mana Yi can run out of mana easily especially after duel, but this will reduce this weakness as it would give him additional at least 4x or 8. Yi himself has high cooldowns and cooldown reduction combined with attack speed can be effective in teamfights. is not a necessary item but it gives 10% cooldown reduction nice damage, health and mana leech. Its good alternative to

70% critical chance
+ +  Basic dominance items, suck it

Defense
+,  tons of armor and health and some magic resistance. With this combination you dont need is probably the best defense vs mages in my opinion. It nullify a champion spell. Highly recommended against casters especially in teamfights

Anti
,, , , ,  tons of lifesteal, magic resistance, armor penetration, on-hit physical and magic damage, criticals, attack speed. Basically this can reduce drastically 's effectiveness. now deal true damage and wont backfire on yi. itself can be usefull on master yi himself to dominated AD champions with tons of critical strike damage. 