I mean, theres a reason we dont call the archetype Animate-Dead-er
Worst of all, it shreds his pristine couture
The benefit for casting those higher-costed creatures is arguably greater, though, as Helga draws a card, gains a life, and gets a +1/+1 counter for each of these creatures cast
There are plenty of outlaw creatures that have a high casting cost, so if you have ways to dump them into the graveyard, you can reanimate them to cheat around the casting cost
They will phase in with that permanent and still be attached to it
You can be especially spiteful with the Bowmasters and Narsets of the world, or you can just play the role of a leech and sit back with your Faerie Masterminds and such