Esper gives us Pongify, Rapid Hybridization, Swords to Plowshares, Path to Exile, Mortify, and Vindicate, so we'll definitely have lots of answers
Getting a second Hearth and Home or Feast and Famine is intoxicatingly good, and you generally have way more equipment in your 99 to copy
Her Trance ability is a small nod to her dramatic battle transformation, where Terra lets the destructive power of her esper half run wild
Colorless mana rock artifacts are a good way to achieve this, but each color of the MTG pie has its own unique way of speeding up its mana production
To solidify their position as a fantastic new option for Aristocrats decks, Evereth, Viceroy of Plunder is also rather threatening
Some of them, like Cosmic Spider-Man or Spider-Ham, are pure fun and flavor picks that invite creative deckbuilding