Dragon Whelp was very much a sleeper win condition, as a lot of players never pumped it enough to kill it, if you were in a long game, opponents may forget you can pump it for more than three
Additionally, the Celebrations collection features a special subset of 25 cards that are close remakes of iconic cards from the entire history of Pokmon TCG
But theres only so many places in a Commander deck for sac-draw spells when you look at the limitations of those cards in comparison to these other ones, and those three dont make the cut
Goldspan Dragon generates 2 mana whenever it's targeted, which comes in handy for when playing it on curve and needing a bit of juice to Counterspell some pesky removal
Oh, and the card is pretty strong, too
Just make sure you grab some mountains before everyone else does