With the prevalence of powerful activated abilities in Commander, Sheldon Menery himself called it a necessary card for Commander and ranked it as one of the top 20 cards for Commander in Modern Horizons 2 when it received a much-needed reprint there
You must sacrifice exactly one creature if you control one at that time
*Cards without a condition description in the card's name are available in Condition: A
Take a look at the card [c]Skull Saucer[/c], for example: Obviously, such a card would never fly (get it?) in a tournament setting
I dont have any concrete evidence to disprove the number 50 however, as anecdotal as it is Ive seen far too many for sale and know some collectors who also own them, to have only 50 wouldnt be realistic
And that ward cost, so punishing in conjunction with its abilities, is also easier to manage in Commander