Enemy got mana from my omen trait and I got a free extra turn

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What you were expecting to happen, and what actually happened:
I was expecting to get a bit of mana from Greed’s omen trait and take 1 turn and then have the enemy take it’s turn. Greed’s omen trait triggered and gave me a bit of mana but also gave the enemy Dwarven Gate’s some mana as well. After that I took a 3 match of red (I think) and it was still my turn.

How often does this happen? When did it begin happening?
This is the first time I saw it happen. The next few battles were fine.

Steps to make it happen again
No idea