There was always a type of basic land to fit your style, something that Wizards of the Coast played into
Heros Downfall is there because we just need removal, thats how this format is
and Sheriff of Nottingham, the primary antagonist
The fun thing is that there are a few different ways to deal lethal damage, and indestructible can prevent death from all of them
For instance, I control the equipment [c]Giants Skewer[/c] and I want to attach it to a creature I control, [c]Faerie Guidemother[/c]
The only thing keeping this card as low as it is on our list is simply the mana cost: six is a lot to ask for in cEDH, and while Consecrated Sphinx will win the game if left unaddressed, it wont win the game that same turn in the way that other high-mana investments will (Hullbreaker Horror, Ad Nauseam, etc)