Simply put, the cards tick all of the boxes for both collectors and competitors
But hang on - what does 'trading card game' mean, anyway
I play this card in my Heliod, Sun-Crowned cEDH deck, where it can be used to make powerful plays such as dropping an early Trinisphere to stop opponents in their tracks
Warp Warp is a mechanic that is geared towards brewing because it is powerful and creates mini-puzzles of how to get additional value out of a summoning sick creature that only sticks around for your turn
My list is, at its core, mostly green
Similarly, if The Soul Stone is already harnessed and becomes a copy of something else, it stays harnessed, though it's very likely that won't be relevant until that copy effect ends