The Darkness Crystal costs four, drops your Black stuff in cost by one, and then your opposing non-token dork death will get exiled and you'll gain a pair of life too, and then tap it with drop one for free on your side tapped with two counters
In some decks its going to be hard to solve this, because your opponent just wont kill this and let you turn the Case into a tutor but if thats the case that probably means they are taking two to turn, so it isnt like thats a huge fail case
However, skipping out on him could be a mistake, especially thanks to his incredibly powerful ability, You're Beginning To Irk Me
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It's a fairly unfun experience
To help with this strategy, we've also got Kediss, Emberclaw Familiar