Imagine a buff to specific champions when they are on the same team, similar to Xayah and Rakan
(Rakan have an increased e range when used on Xayah and Xayah's w effect triggers on Rakan when he is near her)
For example: Garen's Q ms bonus applies to every allied Demacian champion close to him.
Your turn now ;)
and
Sol's passive becomes banana.

- When all of these champions are played together, the enemy are sent to hospital for chemotherapy.
"Galio gains bonus MS around champions based on their AP"

Sniper's Contest: Increased Range on R.
Cursed curse. When he's the only shurima champion in the game he curses the whole map.
Frostbite. Each champion can trigger other champions passive if within 1000 units.
Can't Killean... Reduced cooldown on R
Darius grants Draven his passive :B Draven grants Darius his passive.
grows larger and has an increased hitbox when within 1000 units of an allied or enemy 
.
can proc his w on enemies slowed by
cloud.
spawns more tentacles when near
's abilities now grant 50% attack speed to
's plants.
's E and Ult.
, he gains his invincibility on his ult for it's duration. Then, he can activate his R normally.
's Ebb and Flow deals damage instead of healing allied
.
R cannot be Wind Walled, dashing through Singed's poison dispels the poison trail.
with

... insta win [slayer-pantheon-popcorn]

Allies and enemies cannot interfere between their hunt.