If they don't have a substantial board presence when you cast her, or cards in their hand that can take her out, they're stuffed: they can't go digging for answers
There is no way to interact with nonbasic landwalk outside of removal - but if you have protection this becomes almost impossible
You can only use this effect of "Megalith Promotion" once per turn
In a fun, full circle moment, the team also enjoys that the Hasbro Iron Man helmet was shown on a kid trying to stop drones at Stark Expo in Iron Man 2 (theorized to be Spider-Man), and now that same helmet has found its way onto a Marvel Magic card in a new era crossover of the two IPs
In the case of Affinity, having another free artifact may actually make you more explosive, so its definitely the card I would choose for my sideboard
Certain cards will grant energy counters which you can then spend for effects ranging from damage to buffs to card draw