So, being able to guarantee you get two extra turns sounds like it would be a game-warping card that all extra turn decks should run
Sure, the information is nice, and theres worse things you could sink your mana into, but until you reach a point where you have literally nothing else you can do, youre not going to be using this ability
This is why trample is so important, as it makes it much harder for your opponents to chump block your best creatures if they want to protect their life total
It turns out there was
Then, because it's hard to make a typal deck work when you don't have as many creatures to choose from, we gave the Reaper King a very powerful ability
Blasphemous Act is perhaps the best known of these, being both efficient and powerful enough to remove all but the most resilient threats