Craterhoof is also the final nail in the coffin for Progenitus, a card which back in the day would have been one of the top contenders on this list
The three biggest were the Brothers' War, the Phyrexian Invasion (well, the first one), and the Mending
While it might be tempting to pick up the Dinosaur legends now in case they spike more as Ixalan nears, I'd hold off
The defending player can prevent damage to their Planeswalkers the same way theyd prevent attacking creatures from dealing damage to them: by blocking the attack with their creatures or by using an instant-speed spell to remove the attacking creatures
Then I have three ways to save my stuff en masse, the obvious Heroic Intervention and then two "regenerate your team" options like the Charm
As always, leave your thoughts, ideas, opinions, and suggestions in the comments, and you can reach me on Twitter @SaffonOlive or at [email protected].