As long as your sacrifice outlet can be used at instant speed, you can use it in response to a board wipe or removal spell
Those are references to the two standard group sizes for FF XIV s multiplayer content: Light Parties, groups of four for standard dungeon content
To Link Summon, players must send a number of face-up monsters they control (known as Link Material) equal to the Link Rating of the Link Monster they intend to Summon to the Graveyard
Limited players typically stick to 17 lands for their 40-card-minimum decks, but the aforementioned giant creatures, transform cards, and costly (but great) removal spells like "Merciless Repurposing" thrive on extra mana
And because trading cards possess little intrinsic value, the market is strongly tethered to how people feel about the Pokmon franchise, which went through a period of stagnation in the 2000s in which many collectors moved on from the hobby altogether
The next issue is all the objects a player might control, but doesn't own