This turns the casting of any spell at any time into a non-land Boomerang opposing bounce too
Each release had some lessons, which I'll get to today, and there are some larger trends that some players aren't happy with, which I'll also touch upon
We saw a lot of power, with double Student of Warfare / Time of Heroes nut draws and one-creature wins thanks to the fact that if we can fight through our opponent's removal and max level a creature, most of our level-up creatures can win the game by itself, but we also got Time Walked a lot of times and occasionally just played underpowered creatures (a good example of this was against Merfolk, where their creatures were often bigger and more powerful, even without the extra work of spending mana to level up)
The Commander Rules Committee has stated that this is because it is very hard to kill more than a single player with poison, especially because your opponents likely are not piling on with their own infect creatures
you can choose an opponent who is also invested in removing a problem permanent, and show them removal for it and a creature youd like to reanimate