It seems too complicated for too little payoff. I also can see multiples of these hitting multiple times getting tiring to resolve.

Revealing cards isn't worth that much. For example, Telepathy has never been a competitive card anywhere afaik. A card like Spy Network (nor Peek) isn't bad though but it also has that Index (with -1 from top) essentially slapped onto it - which just shows how little worth the base effect of revealing cards from opponent's hand is.

I could see the potential issues with the current wording of interrogate as you have pointed out. What if instead of having five creatures hitting and causing five separate triggers what if they added up to cause one single trigger of five to make it less of an annoyance and more valuable. It would operate like similar cards like Mire's Toll

t's more... why would I bother? "I got five creatures through; from the size of this - that's 2 power each, so that's half your life. Oh, and I guess I can look at your hand too, for some reason?" It's just not a big enough reward to fuss with.

Now saying that - knowing what your opponent has coming does have value. Just maybe not enough value to be worth a keyword.

Let's look at what jameschanlee has to say about that! They have designed a mechanic called interrogate that actually also has to do with revealing cards from hand, but adds much more punch.

Look at Dream Walker! Now the revealed card can't be played either. Your proposal of randomly revealing would make this more potent as well.

How about:

• "Whenever ~ deals combat damage to an opponent, interrogate them. (That player exiles a card from their hand at random until your next turn.)"

If you want this at lower mana value, this probably would need a safety valve e. g. "(That player reveals a card at random from their hand, then exiles it until your next turn if it is a nonland card.)"

Would create some weird tension to playing lands, maybe, so this needs some more thought put into it.