Think of your own mastery
Defensive tree: Fortification: When you have a shield on (magic damage shields like hexdrinker count as well) you take 3/6/9% less damage.
12 Comments
F**K Teemo: Immune to Teemo Mushrooms and Poison / Teemo Shrooms and Poison makes your movementspeed and health regen faster / Sends the user playing as Teemo a 400GB/S DDoS attack so that they can't play LoL for 3 days.
utility tree->Improved Camouflage->All Stealthing Takes 0.25/.5/.75/1 seconds less to activate
Improved Experience -> Gains 10/20/30 experience every 10 seconds.
Death to all who oppose->Offense tree. Everyone on enemy team loses 100% of max health a second. Countered by teemo who is annoying simply by existing.
Wow, some very op masteries here. Figured most masteries have a value f 200 gold er point, must be wrong.
Easy money -> Utility tree. Get 1 extra gold per kill.
Cocaine. Utility. Movement is increased by 20% but every 5th movement click results in having to stop and talk.
Armor shredder. Icon:this 
but pure black. offensive. % of bonus ad =armor pen.
Runic Mastery: All scaling runes apply full effects even at level 1, and all scaling effects (Unseen Threat, 
etc.) automatically start at maximum power... Scaling into late game starts now!
invincibility(only yeldahman13 can use this mastery) naw im just playing.
i would have to say
Monster stack : every monster kill adds up to how much exp. and goldyour next minion, champ, or monster kill gives up half of this bonus is given to any nearby teammate.
(pointed more towards junglers)not enough masteries for jungs
Life stell: 20/30/40% :)
Haxor. 100% CDR on all champion abilities, items, and summoner spells.