the game is to make the most op thing you can possibly think of, not for both champs, just force all power onto 1 champ, so i'll start
katarina's passive instead of zed's
clarification, the champ doesnt keep both passives, just the new one, just being sure since i think a person or two didnt get it
as of writing this the strongest that has been posted is annie passive on karthus by DECLOVONE, show him whats for, and stop suggesting the obvious ones (
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passive to
passive to
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Passive.
Good luck surviving her ultimate.
everyone with passive
you'll never see it coming
So far i've see many people forget what champs actaul passives are.
passive is random extra gold on minion kill (maybe it was intended for farming)
Is the licks thing, so it would do zaggat on another champ.
To contribute:
with passive, assuming during ult it would reset.
with 
passive, because he becomes old kog.
Taliyah with brand passive, three hits from q or ew or dashing through e would all set off the explosion and wall can make it harder to spread out
passive on any champion in the game
There's probably something cheesy you could do with Bard's passive (maybe on Thresh or a jungler with a weak passive). Just pointing this out
with passive.
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passive on
literally nothing beats that
Trying a new one:
with passive.
She autos or uses Q and then uses her ultimate on you, leaving you snared for a portion of the duration.
with 
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with passive
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with passive
with passive
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with passive
and ofc the strongest
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any adc with 
's passive
just right click to kill
Switch 
passive to 
passive.
The Trio of Power: Durability, Control, and Raw Damage
with passive
Every tick of his W to deal damage and cost health spawns a blob, and when he dies he gets a chance to revive. However, the spells retain their current costs as that's not part of the passive.
/ with passive
I saw someone say Annie's Passive below, but remember that Annie's passive only triggers on spell cast, while Kennen's triggers whenever someone is damaged by an ability, meaning Karthus Aura and Azir Soldiers trigger a stack of it every attack/tick.
with passive
May Rito bless your soul once she levels E, and especially once she levels R.
