The art in this card is absolutely amazing, having been done by Raita Kazama, an artist who has worked with Magic before, as well as the Pokemon TCG and tons of video games
While a certain Felidar Sovereign can win with 40 life, as a creature, it's much more vulnerable as every deck can answer creatures, so they can answer it, and thus I find the Test of Endurance to be more reliable for the turn or so before you win with it
I think having to exile three cards from your graveyard is a lot more fair, and we're a long time removed from the days and format when Psychatog was one of the game's best creatures, but at UB I feel like this is worth a look
For example, if a creature would normally enter the battlefield with three +1/+1 counters on it, it will enter with six +1/+1 counters on it
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It does need some setup, but if set up correctly, will win the game outright