I actually ended up cutting my deluge, it was really clunky are 3 cmc and a lot of the times where I needed it I didn't really have the life total to support it. You get these random hail mary plays where it feels super good but past that it wasn't that good, atleast for me.
I like to have at least 1 Toxic Deludge in 75. To kill a 5/5 against Grixis is importment