Knocking out all your opponents Pokmon : No bench, no battle
I can only get the lessons that are in the first seven slots, because, at the time, players put 14-15 different lessons without any downside in their sideboard, so WotC limited it to 7 slots in best-of-one to reduce this strategys effectiveness
Green I'm not sure what a better creature would even look like
Commander players, being the big creature lovers that they are, aren't overly fond of this black instant, but Fatal Push turned 60-card formats upside down and is still a staple from Pioneer to Vintage
Thats no mean feat for any new Magic card
Brynhildr could potentially see play in a casual or theme deck, but may struggle in a more competitive setting