But anyone trying to pass them off as rare or official is scamming you
A quick search of Scryfall reveals over 850 instances of the text "at the beginning of your upkeep," so there's a plethora of options when producing a Commander deck based around upkeep triggers
As such, if you have Castle Locthwain in your collection, you should play it, but if you don't, I'd make this the lowest-priority card in the deck to spend your wildcards on (although it is worth adding to your collection if you are interested in Explorer or Historic because a lot of decks play it)
These points can be used to exchange for cards, if you have your heart set on a particular one (Pidgey hive rise up)
The morph is rarely of use, particularly as the only monster in the A cube with morph somewhat reducing the surprise factor
Note: Do NOT try this trick on the coin flip that determines who\ s turn is first, as your game will NOT save 60 Free Energy Cards The tech in the upper-right corner of the Mason Laboratory will give you 60 free energy cards if you dont have any energy cards (other than the ones in your deck)