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You can also use it politically to save an opponent from attacks, if the mood strikes you

You can engineer situations where preventing the damage to your creatures blows your opponents out, especially if you tack a Lure onto a Voltron commander

Keep in mind that Preacher's deathtouch makes him a great blocker and making use of his high toughness often means not blocking smaller creatures so that he can avoid removal like Lightning Bolt and Shock

While the "once per turn" limitation sounds rough, don't forget it's a "you may" ability

But for those who dont want to build a deck the Sealed, Draft, and Pack Rush formats are a great way to learn the cards and plays Lorcana the forethought of deck construction or the competitive meta game