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Even if it was your choice to discard the card, it's still an opponent's card, which your hand should be protected from.
Always get a chuckle re-reading these stories...I have one from this past weekend that wasn't exactly a "terrible" play...just one of those "Are you kidding me?" moments that tend to happen in booster draft. It was my turn and I had 4 LS. All three of my opponents had Lost Souls out, but two of them seemed much more vulnerable in terms of defense. I had several Clay Heroes and a couple clay battle winners, but I also had Faith of Jacob. I decided I was better off getting multiple Heroes into battle right away so I used Faith of Jacob to take two of my brother's Heroes, one of which was able to start his WC banding chain and then I grabbed his Jacob (CoW) since I figured why not protect my hand for what should be the final battle.I push the 3 Hero band into battle against the opponent I felt had used up most of his defensive options. With a resigned look, he reluctantly blocked with Spirit of Fear (Withdraw all Heroes in battle. Opponent may allow you to discard a card at random from hand instead.) No big deal I thought since I didn't actually have anything to play on the Heroes in battle. A moment later I realized the crushing truth (as did my brother)...CoW Jacob was now protecting my hand thereby not giving me the option to instead the withdraw... As it turns out, if I had just attacked the other player I thought was vulnerable, I would have walked in for #5--instead the guy who blocked me ended up getting to 5 and I ended up in second...