If you exile any token, including Blood tokens, they cease to exist and cant return to the battlefield
If this card is Fusion Summoned: Banish all Machine-Type monsters in the Graveyards, and if you do, inflict damage to your opponent equal to the number of monsters banished x 300
Youre allowed to use cards from the most current Magic set all the way back to old sets from the 90s (note: you should follow the Magic Online legality restrictions for Pauper when building your deck)
Being able to remove whatever nonland card for just one mana and two life is really key: you can play it on turn one to map whatever your opponent is doing, you can delay it to snipe a Lurrus or to jam your combo immediately Its hard to say how much I love this card and how much I think its an egregious design
Able to grab the best card for any situation from your sideboard, if you have a Karn on the field, you're prepared for anything
In short, I would not be surprised at all to see most of these showing up in some Commander decks, so why not see where things currently stand among Spirit Dragons before our newest crop arrives on the scene