Oko showed us how a planeswalker that generates creatures while ticking up in loyalty can be a force to be reckoned with, and while Nissa isn't as hard to deal with as that apocalyptic prankster, she is still pretty menacing
Of course, its perfectly possible for your opponent to have enough characters to do eight or more points of damage in a turn, but its not easy, and it gives the Determined Defender Pluto a solid leg-up as a mighty wall for your field 1) Dragon Fire The only action card on this list (indeed, the only non-Character card on this list) Dragon Fire is here for the same reason Helga is here
Beast Within Your 10/10 is a 3/3 now Beast Within is one of the best removal spells that Green has in Commander, and possibly in any other MTG format too
His level up cost is only one which allows you to efficiently use all your mana and means that you can still win games with and 8/8 dragon off two lands if really needed
Shorikai, Genesis Engine Even ignoring obvious infinites with Intruder Alarm, Shorikai, Genesis Engine is just a sweet value engine
When I look at the formats page, there are seven listed Commander, Standard, Vintage, Legacy, Modern, Block, Team Unified Constructed