post a screenshot of your roster

Do you happen to have any champs with leech? The two champs on your team that need replacing are Dazdurk and Tayrel. Brago makes for a great replacement for Tayrel if you have him fully booked - he brings DEF up and ATK down. Ninja brings DEF down so you donèt need Tayrel for that part either.

Do you have Ghrush? He can bring leech. But much better would be Corpse Collector if you have her.

I think Vogoth is a very good leech champion as well. His passive healing effect is great, especially if you build him with high hp and a bit lower def, so gets a lot of damage.

Why so high on Corpse Collector?

Very few other champions bring both leech and poison. I find her to be almost irreplaceable, personally.

Here is my roster including the vault any sleepers for CB?

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Here is my roster including the vault any sleepers for CB? 

Indeed, one of the best decrease atk champs in the game sleeps at lvl 1 in your vault: Jareg. He would fit much better to your team than Tayrel. The decrease def from the latter is redundant, Ninja allready does it.

thanks for the tip so you recommend me to level jareg and replace tayrel?

Lol, stop buying shards!  I don't know where to start, you have so many good champs...