Creatures that enter the battlefield attacking were never declared as attackers, so they won't count toward melee's effect
Quoting thegamer, the cards are are selected based on their gameplay and story value, and in particular how each character relates to the overall narrative of the set
Please note that you cannot use your Yuna, Grand Summoner promo in your Magic: The Gathering FINAL FANTASY Holiday Commander Box League deck
7 Time Wipe Is Best Used In Voltron Decks Time Wipe is an Azorius board wipe that exempts just one creature from destruction, and that is much more helpful in some builds than others
You could use the Cauldron to set up a slow loop of sacrificing and reanimating two creatures with powerful enters abilities or just turn a random pest into an Archon of Cruelty, whichever suits you in the moment
Recent sets have made it even better as Wizards increasingly expands sacrifice outlets to sacrifice creatures or artifacts