To be clear, theres no way all these decks are anywhere near the same power level and the dust will settle into a normal-looking format at some point, but right now, there are so many things to try that people are picking up 5-0s with literally anything
Thanks to the limited amount of cards in Pioneer, the heavy-hitting mill cards most would be familiar with are unavailable
Boneyard is a site that allows both players to do so when in enters the realm
General Leo Cristophe* If Leo cost a bit less mana hed be much higher up on this list, as at 5 mana returning one cheap creature, and growing based on how many creatures you have is just not that good especially given he lacks any protection or evasion
Its also an instant that can fire off when your opponents shields are down and can be foretold to save a bit of mana, increase the surprise factor, and net a whole mess of life