Heathstone - Phantom cards

Hello, if the title didnt give it away theres alot of weird effects in this game which allow you to copy an opponents entire hand, or literally add cards that arent even in you deck or card collection to your hand out of thin air which obviously doesnt make sense, adding cards from your deck or graveyard (if there is a graveyard) to your hand makes more sense since your playing with cards you own and that actually exsist in your deck, so please fix it so the game doesnt seem like it magically creates random cards from nothing. Also cards that turn minions on your field, hand and deck into legendary should simply be removed because thats obviously stupid and makes no sense.

Thanks for your time.