Portal used plain terminology in its rules and materials
Red Card can throw a hiccup into your foe's plan through the uncertainty of replenishing their hand with random cards, while X Speed can help support the transition of play from Moltres to Charizard without giving up a point
While there are likely still older MTG players who would still rather Magic stayed as Magic, were rapidly heading towards two of these sets a year plus all of the extras, so this is simply how the game is going to be going forward
Necron Dynasties features the Unearth mechanic, an old keyword that lets you bring a creature back to life and give it haste, exiling it at the end of turn
Red is popular, so this fits in Jeskai decks nicely
If that creature isn't a Zombie, it becomes a Zombie in addition to its other types