I just thought of a probably soon to be meta build. Thoughts?
Okay. I've been wracking my brain with ways to abuse the upcoming items so hard that Riot regrets adding them, so here goes:
I think I've come up with a 6-7 unit all but lock build with room for probably up to 2 more units.

Give Akali Mittens, Dragon's Tooth, and 
Result: Akali is a Yordle, has 83% Magic Resistance, has 25+10+20+20 (75%) Crit Rate, and her skill has crit imbedded in it. Will Crit for 375% damage, multiplied by Ninja's 70 AP (or at 2 stars, for 1,753 crits!)
Give 2 more members (preferrably Zed/Shen) Mittens.
Result: (6) Yordle Assassin Team.
Akali now also has 55+20% (75% Dodge) along with the other two Mittens Wielders.
I'm arguing Gnar, Poppy, and Kennen for the purposes of Ninja, and a solid front line of Yordles who are potentially also good Assassins.
Keep in mind that if you Yordle Shen, he will ALSO have dodge in between his skills...... Nearly unkillable (especially if he ALSO has a Dragon Tooth)
Before you counter that you can always get Last Whisper to counter this:
-
It's no longer going to be on a corner unit that can stand on the back lines far far away and nuke you before you can reach them, unless they also have a RFC......
-
They aren't going to kill a 83% Magic resist Akali with 75% Dodge/Crit before she kills them.
Keep in mind this is only 7 units. You can probably get 2 more (assuming you don't have 5-6 Spatulas in your pocket) to add on, and even add Sorcerer to this build (Sorcerer + Ninja + Crit Akali is over 2400 damage crits) with Lulu and Veigar (and less Assassin Yordles; Trade Yordle Zed for Sorcerer Akali for example, and possibly lose the Dragon's Tooth)
#My only concern with this build: 4 Gunslinger build with 4 Last Whispers.