If, for one of the targets, the player can't choose a new legal target, then it remains unchanged (even if the current target is illegal)
If you were a genius child who played by every rule and mastered nuanced strategies, then you're probably an exception, as most of us struggled to make sense of the rules
Thats right, it took over six years for Mark Rosewater to push through Magic s second Un-set
Brand Break Ties Broadside Barrage Broken Concentration Catalog Cathartic Pyre Censor Chain of Plasma Chandra's Defeat Change of Plans Channeled Force Chilling Grasp Choking Tethers Circular Logic Clear Clutch of the Undercity Complicate Constricting Tendrils Coordinated Charge Countervailing Winds Creative Outburst Dangerous Wager Dark Withering Death Pulse Decaying Time Loop Decree of Savagery Deem Worthy Demand Answers Deny Entry Desperate Ravings Dihada's Ploy Dismissive Denial Dissenter's Deliverance Divide by Zero Dizzy Spell Djeru's Renunciation Djeru's Resolve Don't Blink Earthbrawn Easy Prey Electric Revelation Enhanced Awareness Enthusiastic Study Expunge Fade from Memory Failed Inspection Faithful Mending Faithless Salvaging Fall to Earth Farm // Market Fast // Furious Fateful Showdown Fend Off Fiery Fall

Final Fantasy has an artifact theme in Esper led by Noctis, Prince of Lucis, which lets us cast artifacts from our graveyard, and supported by cards including Golbez, Crystal Collector, Ashe, Princess of Dalmasca, and Edgar, King of Figaro
Here is the official link for Collecting March of the Machine: Thats got all the information we need for most of this