You can pick one champion and give it another champion's passive (the champion also keeps its original passive).
IE: Vayne now has Naut's passive O.o
Make it as broken as you want.
Anivia and Kogma
An egg with legs
Caitlyn with Tristana passive. Or Ashe with J4 passive.
Poppy + Corki = 10% Extra damge, 50% less taken
Edit: Or Garen+Mundo=Insane HP regen
Tryn with Varus' passive...Good lord let Death Reign on Blades of Steel.
Anivia's passive combined with Karthus' Passive xD. You die, then you're half dead body turns into an egg, and you're alive again! That would be so OP though...
Urgot/Udyr/Yorick/Lee Sin with Malzahar Passive
Veigar with Katarina passive. XD Prepare for pentakills.
Edit: Teemo with Leblanc passive or Twitch passive
Warwick with Jax.
Tristana on any melee champion.
Karthus with Annie's.
Stuns. Stuns everywhere. Plus the ult would be fun. Stun the entire enemy team at once.
Or maybe even Vayne with Teemo's. Peacefully farming, suddenly a wild Vayne appears with a huge AS buff!
Bronze V Jungler
Mundo with Malphite.
Oh god so OP. xD
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