Exiling two target permanents (any permanents) is a nice way to turn a game around, and even if your opponent can keep chumping it, Ulamog will just mill them out in a couple of swings, anyway
If either lives long enough to go to work then things can get crazy fast
$0.35 Jukai Trainee (Showcase) Kamigawa: Neon Dynasty Variants $1.49 Kasmina, Enigmatic Mentor (056 - JPN Alternate Art) War of the Spark JPN Planeswalkers $5.49 Jace Beleren (Japanese Jace vs
So far Stock Up hasnt seen a huge amount of play elsewhere in MTG, but there are signs that it may be good in Standard
I used to put The Immortal Sun in the majority of my EDH decks, as well, as it is such an overall useful card, but I eventually removed it from those decks, because it is expesnvie and takes too long to provide any significant benefits
What makes its random ability even funnier is that it is an 0/2, meaning it is likely to eventually kill itself