Sword of Forge and Frontier An interesting card that was actually designed by a fan years before Wizards got round to it, this 'Sword of' gives protection from two-fifths of creatures, and has two very relevant ramp and card advantage abilities
Yellow's primary defense is the Trigger chain that fires when Life cards are revealed, so Yellow skips blockers entirely and runs fewer counters than Red (6-10 is common)
Thankfully, Gatherer and Scryfall help to fix this problem, however, that only works if you can access those websites
Each category has hard rules (like MLD forcing Bracket 4) and soft signals that determine your overall bracket rating and power level score from 1 to 10
Its especially important in EDH, where you need to outvalue three other players and games go really, really long
With knowledge, you can get the best possible price for a card