Aside from inherent balance concerns, the amount of ephemera required to represent this mechanic is just exhausting: an outside-the-game rules card to explain the effect, an emblem plus tracking token to represent its current properties, and an additional way to track which creature its currently applied to
Lands you control dont untap during your next untap step
You can grab a regular sleeve, the occasional Secret Lair art sleeve, or an exquisite sleeve, which serves the same function but features nifty animations instead of a static image
Yep, my favorite GS is at the very bottom: Regirock
If youre in a hurry to get your cards for an upcoming tournament (though custom cards might not be tournament legal, but hey, maybe you just want to show them off), you can often pay a little extra for faster delivery