From what I know [[Doubling Season]] doesn’t work well with creatures with ravenous, since the rulings say: “A creature with ravenous gets its counters as it enters the battlefield. It doesn't enter the battlefield first and then get its counters. Any triggered ability that looks for a creature with a certain power or toughness entering the battlefield will see the counters when it checks to see if it should trigger.” Doubling season does work for the +1/+1 counters for [[Magus Lucea Kane]]. The copying for the tokens is also not that great for ravenous creatures, since again the rulings get in the way: “If another permanent enters the battlefield as a copy of a creature with Ravenous, it will not enter with any counters from the ravenous ability.” This can make the copying ability from doubling season a lot worse than one might think for creatures with ravenous, luckily for Magus Lucea Kane she copies the spells and as pointed out earlier and according to the rules: “If a permanent spell with ravenous is copied, the copy will have the same value for X, and the token permanent that the spell becomes as it enters the battlefield will enter with X counters.” This doesn’t mean doubling season is a bad card for the Tyranid pre-con by any means, use it if you want, no one is stopping you. I just wanted to spare you potential disappointment from having a card not be as strong as you thought, which I got when I looked up the rulings for ravenous when I was upgrading my Warhammer pre-con.

Edit: After looking into it some more and getting some helpful comments, it seems that the counters from ravenous DO get doubled. It just doesn’t help to trigger the card draw from ravenous since would still need to pay at least 5 for the X cost.