If, for any target, you can't choose a new legal target, then it remains unchanged (even if the current target is illegal)
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While its not quite as potent as Teferis Protection, it does still offer a way for green players to protect their permanents
These cards are fairly powerful, but get even better when the requisite of having Arceus in play is met
This could be accomplished by using Girsu, the Orcust Mekk-Knight , Armageddon Knight , Dark Grepher , or Scrap Recycler to send World Legacy World Wand to the graveyard
While you wont always control the creature (since it is unlikely that youre always going to be the Monarch), the fact that the creature cant attack you makes this a lot less of a problem