These promos were won each week in Standard Showdown events at your LGS
Removing Zeus still denies his 2000-power body and stops her from replaying him if she draws another copy, and that costs you a card or DON that would otherwise advance your board
They pick it up, scan the barcode that comes with it, quick glance at the centering, whitening, look for dents etc, then slap a number on it and move it on
The best user for this is without a doubt Calvin if he is doing a "Blessed Survivor" because he is encouraged to keep, his health and sanity low, but even the Calvin can instead use Signum Crucis to take advantage of the fact his base skills are all 0 to generate tokens equal to the test difficulty
If the affected artifact or creature gains an ability after Oko's second ability resolves, it will keep that ability
Found very rarely within 1st edition Jungle packs