Season 6 should make all champions on the field something not to be taken lightly, and should focus more on the power of team work.
Season 6 new item:
Power Rangers Hextech Wristwatch(1750 G)
UNIQUE Toggled Ability: Team Up!
When toggled on by all champions on your team, you all merge into one super-Champion, gaining 70% of the cumulative Health pools, AD, AS, AP, CDR, etc. of the champions merging. All champions must buy this item and toggle it on for it to work.
The super-Champion follows all move and attack commands any member of the team gives, canceling prior move and attack commands just like it would if it was controlled by a single player. The super-Champion has all abilities, items, and Summoner Spells of the constituent Champions, which are controlled by the corresponding players.
Selling this item, toggling it off, or being killed ends this effect.