What Makes a Card Valuable Rarity: Secret rares, special illustration rares, and alternate arts are printed in smaller quantities Popularity: Charizard, Pikachu, and Eeveelution cards command premiums purely because people love them Age: Older cards, especially from the WOTC era, tend to be more valuable due to limited surviving supply Condition: The same card in PSA 10 can be worth 5-20x what it's worth in PSA 7 Cultural moment: Cards associated with viral moments, anniversaries, or media events often spike in value Competitive playability: Cards that are strong in the TCG competitive scene have additional demand How to Check Prices Misprint: Best for graded card prices with historical data and pop reports TCGplayer Market Price: Best for raw card market values eBay Sold Listings: Filter by "Sold Items" for real transaction prices across all card types PriceCharting: Good for quick lookups and trend data Never rely on a single source

Sealed market tracking Boxes, ETBs, displays, boosters: every sealed product tracked with live and historical prices
Certain creatures would gain a bonus during Day while others would gain one during Night
You could potentially run more (and would in mono-white) but chances are with enough of the dual-typed lands, you can have enough Plains across your manabases nonbasic lands
This is a free Negate in most instances
Or both if you fancy it