If you really want to hide it, it is possible, but the templating would be kinda annoying, and probably not worth it, as you'd have to word it like illusionary mask and necro combined.
Something like this:
Vicious Tutor

Sorcery
As an additional cost to play Vicious Tutor, pay X life.
Search your library for a card with a converted mana cost of X or less and remove it from the game face down with X mask counters on it. You may play that card as if it were in your hand by removing all mask counters from it and turning it face up.
However, revealing seems like a much more simple solution.