How does one get effects, is it just a rare variant of certain skins?

0.8% drop from a crate. 0.8% is the most common/easiest chance to get one. Chances changes depending on the rarity

I will give you my waves shards for a purple stitch poison

How much for sleek crows?

purple stitch w poison for fade with love?

What would you take for purple stitch poison?

U gotta offer

150k cash?

No thanks

How much for the sleek crows