These Warhammer decks are extremely tight-knit flavor-wise and I can see folks keeping them intact as a closed environment (although it feels like the Necrons and the Tyranids will probably outpower the other two, the former with synergy and the latter because it ramps and scales better). Even taking out the cohesiveness of flavor, they still feel generally stronger than the typical precons (and the flavor does cover up the fewer janky reprint choices). Heck, you could just replace the face Commander of the Tyranids with Animar and that's the deck Animar wished it had back in 2011.
Realistically I don't expect to see a lot of foil singles in the wild to pick up (because of how limited they are) so I'm pretty much skipping the same way I already skip regular precon singles because there aren't even foils to begin with. As someone who already sits with the powers of old, I don't really feel threatened by these cards. For example a lot of the Tyranids, while obvious homeruns for Animar, are just stat-sticks at the end of the day and those with marginal benefits don't really outpower all the highly contested slots of my Animar deck. Animar also runs Cascade, but it's already an overwhelming card-advantage mechanic because of the deck (being battlecruiser), I don't want to draw more attention to it by running "cascade benefits" cards. Even something powerful but out of my suite like
Trazyn the Infinite is "just another infinite combo" in the books and can be prepped for accordingly and would probably run its course of boredom in quick succession if it even shows up, that is.
Can't be bothered to give this a proper review, but I'll pick a small selection of new cards that have my eye, but there's no real FOMO if I never ever see a foil single to acquire locally.
Sicarian Infiltrator - Squad gets Animar discount, so is effectively an X-draw spell there.
Mandate of Abaddon - I mean I do love my
Daemogoth Titan-esque cards in Karador and a 4-mana wrath I can easily come out ahead is pretty swell.
Poxwalkers -
Gravecrawler. Need me explain more?
Biophagus - I mean, I run
Opal Palace in Animar, this would do nice work and benefits off
Raggadragga, Goreguts Boss (in the 99) as well.
Tyrant Guard - Animar-custom
Heroic Intervention and doesn't whiff on Cascade since X is just a bonus. It's the card in this short list I would put #1 in priority if I had to rank them.
Tyranid Prime - Probably will just end up like a variant of
Master Biomancer in the end (and the Biomancer recently fell out of favor), but probably the most enticing of the "fun" cards for Animar.