Shadowverse

I've calmed down a bit about this card after reading how it's supposed to be used. Take a look. In the early game, we play Shadow Imps for 1-6 mana. On round 7, we play Dark Alice. She bans all Imps, and then we topdeck Lucifers, Israys, Bahamuts, Zeuses, and other overpowered creatures. Plus, the neutral Mordecai. The Shadow Jack is coming.
But such a strong anti-synergy with the class mechanic is not something to be happy about. Why, why make a card that breaks the entire class, just to force players to build neutral decks? Ugh.

I don't understand how we're supposed to "topdeck" them. And what if we keep drawing Shadow Imps?
It's more likely that in such a deck, you need to get rid of Shadow Imps altogether (except for the most useful ones) and focus on control. Or have a small number of various attendants to use with a book. Maybe with this card, you can somehow combine it adequately with the amulet that turns creatures into neutrals and/or the guy (forgot his name) who turns a ban into destroy. But it still won't help against clearing the hand. Another option is something that draws a lot of cards, like Soul Conversion, but I'm not sure about that either.