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I like Planeswalkers, they're cool and fun and powerful.
I hate playing against Planeswalkers when I don't have outs for them.
To that end, I've thought about different ways colors and combos might be able to face them.

Disrobe

Instant
Uncommon
Choose one - destroy target artifact or enchantment, or remove all counters from target permanent.
It is better to die than be made an example of.

-I'm not sure how much design space black has for ripping counters off of things, but I think we might be able to open it up more by spreading the love into gold.

Death Sentence

Enchantment
Rare
When Death Sentence enters the battlefield, name a creature or Planeswalker
, sacrifice Death Sentence: Destroy target permanent with the chosen name.

-So far, 'destroy target planeswalker' seems to be a thing, but I'm not sure that's strictly necessary, especially given how little difference there is between creatures and walkers conceptually.

Lab Explosion

Sorcery
Rare
Lab Explosion deals damage to target player equal to the greatest number of counters among permanents they control.

-unsubtle, but so are Planeswalkers

Trial by Fire

Sorcery
Rare
Trial by Fire deals 5 damage to target player. That player gains 3 life

-I feel like burn aimed at walkers can probably afford to be cheaper than that aimed at players. Like how Flame Slash is so much cheaper than the flexible Flame Javelin or Char .

Mana Seep

Instant
Common
Counter target spell unless that spell's controller pays or removes counters from a permanent they control.

Unwelcomed

Encantment
Rare
Whenever a creature attacks a planeswalker, that creature gets +2/+0.
These matters do not concern you, foreigner.

What sort of unexplored space do you think exists for Planeswalker hate?

Cost of Meddling
Enchantment
Planeswalker abilities cost an additional one life to activate.
You would dare meddle in my affairs planeswalker?

Made it black because of the flavor text on Lord of the Pit in angelic vs demonic. 

Fair enough... Probably five or six.

I'm of the opinion that planeswalker destruction should be BLUE, because blue is the only color that doesn't destroy permanents (see also my recent thread on Banishments, where I allow blue to banish planeswalkers).  Here's an example.  Title needs work.

Misfired Conjuring
Instant
Choose one: Return target permanent to its owner's hand, or destroy target planeswalker

(Possibly add an Entwine of )

when this enters play, put X of your life chips onto this