Played game recently where the Shaman hero opponent dealt over 30 face damage, seems to be using the titan for the -3 to spell cost but the effect does not reside after first spell is cast, unsure on how they got it, but were able to chain about 4 spells together and get +3 spell damage in minions
Nothing really looks like a bug in what you are describing
There are plenty of ways to deal 30 damage in one turn from hand with spells and spell power minions
I’m not sure what it is that you are reporting. I assume you met the Nature Shaman. They can discount nature spells, discover new ones and can OTK the opponent in 1 turn.
And where is the bug? Please be specific.