Discard spells are notoriously powerful, and Thoughtseize is arguably the best of them all
However, this is just speculation because there are lots of experts who say reprinting these cards would still not affect their prices all that much (at least for the original version from older sets, that is)
When you can pack a load of narrow tools into your sideboard and have access to them game one without any risk of drawing them and having dead cards Living Wish is a little oppressive and outclasses Demonic Tutor
Whenever one or more Assassins you control deal combat damage to a player, exile up to one target Assassin card or card with freerunning from your graveyard
If you discard a nonland card this way, put a +1/+1 counter on the creature that connived
It's semi-restrictive in its targets as far as 1-mana counters go, but can very effectively shut down control decks