Updating with another mana event that benefitted my opponent.
Game was in the second Training Grounds event just now. The one where I can use any cards I have.
I have opened my Battle Log to track what happened to report it here.
On the turn previous to mine where my opponent received mana that I do not believe he was supposed to, my opponent cast both Fabled Passage and Castle Can’t read.
On my turn, I gained 8 green mana and 2 Loyalty from Improved Major Radiant Blessing. Oren Reef the Vastwood was triggered and I drew Sentinal’s mark.
I used the ability Emperor’s Warcry.
I drew Rishkar’s Expertise, Deploy the Gatewatch, and Deathsprout.
Then something weird happened.
It looked like the support controlled by my opponent, Castle Vantress, procced as if it were the beginning of my opponent’s turn, but it was still my turn. Several gems turned blue and my opponent gained 3 blue, 3 red and 5 loyalty.
I cast Rishkar’s Expertise and the card worked perfectly except that the 6 blue, 3 black, 31 green and 9 loyalty all went to my opponent instead of me.
The Battle Log just shows that the mana was obtained, it does not say where it went. My opponent then had full mana on his 3 cards which he had not had before, during my turn.
I then cast my creatures, which thankfully stayed on my side and ended up winning, but having Rishkar’s Expertise benefit my opponent during my turn was very bad.