It can be anythingpower, toughness, something in rules text, the name of a card (Four Wishes, anyone?), collector number, and so on
Having two of those 7-cost Foxy Characters in play can be devastating for the opponent, a -2,000 will effectively shut down any aggression, especially if theyre relying on low-cost multiple attackers to chip down on your Leader
Each has different abilities and favors a specific style of play
Finally, Enter the God-Eternals is pricey, but it slams the door on aggressive decks and, in a mill deck, often acts as a three-for-one
Imaginary Threats: The enabler an Afflict deck needs
Im not ashamed to play one, but even a slower format like this still rewards efficiency