The idea of these cards is to imbed 3 cards during deckbuilding to have a tech sollution during a game. so you can tech against deck that you have a unfavorable matchup against. Also those can be used to find a situational card at a moment when you might need it, is your opponent almost dead, Fireball... are you almost dead, Reno Jackson... is your enemy annoying you, annoy back with Annoy-o-Tron...
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To live is to suffer, to survive is to find meaning in the suffer!
I like the concept. It is really fitting for a virtual card game.
But it wouldn't make the ladder more playable (in the "balanced" sense) since it will bring its own OP cards and combo plays. Your main reason for this is teching. But have you been "Teched" before? Thus, it will become the new "cancer" of the meta, and what will counter this? A tech for the tech? xD
Maybe if this worked with a Legendary like Prince Malchezaar and Benedictus. "Start of the game: Put your embedded cards into your deck"
*Obs: we don't have interaction of Discovery in "Cast when drawn" because it may trigger in the opponent's turn.
You should be asking for a comprehensive analysis and nerf for DH if you want playable ladder instead. People are way way into tech, Jesus. Asking for a whole new mechanic to 'sidedeck' tech for ladder, that's hardcore.