-2/-2 is already a reasonable removal spell for the early game, but you can easily sacrifice a throwaway artifact/creature to kill just about anything in the format
If you need a way to destroy a problematic land, search for a Strip Mine
Competitive 60-card decks usually play fewer, focusing on 48 copies of the most impactful ones
At worst, you can play it and copy a basic land, which isn't exciting, but it's often worth it, considering the only real downside is that the land comes into play tapped, while it has the potential upside of being a copy of the best land in play
We mostly covered it in this article but when Merlin fights with Madam Mim they both change into many different animals
Create an advertisement on eBay and Craigslist to sell your collection to a private buyer