Hi,

Judging from the interaction between poisonous and Wild Pyromancer, any minion that deals damage to another minion should benefit from the poisonous tag if you somehow manage to get it on there. I haven't tested all of these, I noticed the inconsistency when my opponent played Crackling Razormaw on a Fiery bat, the Fiery Bat itself had the Poisonous effect but the Deathrattle just normally dealt one damage?

Please help.

I didn't find the right solution from the Internet.

References:-
https://eu.battle.net/forums/en/hearthstone/topic/17615411959
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Thanks