[7] Up until Version 3, League play was another method of competitive play
Though your child and their friends may have no issue at all with having fake cards, which are more prevalent than you may imagine, they will often be unusable in games, even if they play casually with friends, due to typos, errors and poor print quality
There are a few decks on the cusp this might be a good part of in Standard
Much like with Serra the Benevolent's Worship emblem, a bunch of popular decks in Historic are very close to drawing dead to a Serra's Emissary naming creatures
When you have situations where they will not be getting the chance to usefully replay the card in question Boomerang is comically better than Vindicate, one less mana, one less colour, instant speed and not even triggering any "when this dies" effects
Beyond "Perpetually," the other two new digital-only mechanics include "Seek" and "Conjure"