As usual, take this with a grain of salt. I’m not saying this is going to be something playable, but simply an idea someone with more time could possibly perfect.
Two ways I might see this working, but since we need Eerie Interlude, white is mandatory. Otherwise, I’m not sure, because red and black have different approaches to what allies do. The white base is going to be pretty the same, but red will be more aggressive and black will be more grindy.
The random one offs and such are there for various, hard to predict effects. Sadly, you can’t trigger them midcombat with Eerie Interlude, but you can, for example, tap your opponent down if you have Kor Entanglers.
Some self-mill would be great here… Multiple Kalastria Healer can really punish the opponent.
I’ll add an equipment theme for fun. You might want to cut that for Reckless Bushwhacker and other more aggressive cards.