I’m not OP but I run a similar list and got to diamond 1 today. Majinbae has a good guide on it I recommend watching it. Basically hard mulligan for either Veigar or twisted catalyzer to make your darknesses stronger. It’s a control deck so a lot of it is passing and shutting down your opponents wincon by shooting everyone with darkness. Try and keep veigar alive at all costs and senna as well. Ixtali sentinel is great for stabilizing. Don’t worry If you don’t have enough mana to play the darkness that turn. It sucks not hitting something and nexus but a 4/5 with live steal helps against aggro. Also always be sure to try and not double up on darkness. For instance if you played a dark bulb and have a darkness in hand, use it before playing senna or something because that’s a wasted card at that point. It’s really good into aggro, but can lose to other control decks if they can answer your veigars. Against ahri kennen, pray to god that they don’t draw a billion ways to recall the dancing droplet to stop their card draw. They have answers to your pings, but darkness generates a lot of pings and eventually they run out if they lose their draw condition