This was fixed quite some time ago. Now when you play a spell or a card on the field dies, it goes to the bottom of your deck. The case you're probably noticing is when your opponent has a large number of units on the field, it doesn't take long (or any time at all) before spent or killed cards can get back into their hand. If there's 6 enemies on the field, that gives 5 cards in their hand so only 1 in the dead pile. Cast one card and the dead card is then right back in their hand. If they have 7 on the field, that card can come back instantly.
But hey, check yourself in friendly fights if you want to confirm.
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