If you want excess blue Leylines to be pitchable to stuff, why not pitch it to that unsummon pitchspell (from Timespiral maybe?)
The only thing it doesn't hit is Inkwell Leviathon.
Also Misdirection.
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SnapbackDon't think that is good enough, but Misdirection seems fine.
I think the best hate creature mix is found in green and white creatures. Especially Qasali does most of the things you want Null Rod to do. Next color would be red, adding Groilla Shaman und Tin Street Hooligan.
So if, you want to have Null Rod on legs, your deck would be GWR.
But with Leyline and pitchcards you are left with blue, and Chrome Mox says "don't play too many colors". So you will probably end up with an UGW shell.
Leyline and pitchcards also spell card disadvantage, which means you will need a strong card drawing engine. Bazaar/Squee is strong, but has few synergy with Leyline and pitchcards. Confidant is not an option because you don't want more than 3 colors.
Possible solutions:
- Cold-Eyed Selkie
- Mystic Remora
- Heartwood Storyteller
(Just throwing those out here without elaborating on advantages/disadvatages.)