It's not. I read this card wrong the first time as I suspect you did as well. It is not triggering a deathrattle effect (bolded Deathrattle got me). It is saying DEATHRATTLE MINIONS you play cost 3 less. So the card is in effect only as long as this is on the board, and it only affects deathrattle minions that you play during that time.
I have tried all other suggestions on about 10 different forums and nothing worked. I found that LUMENATA PRO software which is the default for my Sentey mouse was the culprit. Exiting this program completely solved my problem. Something with it running was conflicting with Hearthstone. Completely clean fps after killing it.
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It's not. I read this card wrong the first time as I suspect you did as well. It is not triggering a deathrattle effect (bolded Deathrattle got me). It is saying DEATHRATTLE MINIONS you play cost 3 less. So the card is in effect only as long as this is on the board, and it only affects deathrattle minions that you play during that time.
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**FOR ALL USERS OF A SENTEY MOUSE!!**
I have tried all other suggestions on about 10 different forums and nothing worked. I found that LUMENATA PRO software which is the default for my Sentey mouse was the culprit. Exiting this program completely solved my problem. Something with it running was conflicting with Hearthstone. Completely clean fps after killing it.