Once, two copies clinched a war of attrition, and a second time it provided a handy sacrifice for Boilerbilges Ripper to clear my board alongside a Fear of Burning Alive
Protection Supplementing the interaction that would otherwise be used to protect your own wins is a suite of protection specific cards that, thanks to the presence of creature-based tutors, are much more reliable to find in the average game than they are without those tutors present
Some void abilities, such as that of Kavaron Skywarden above, are triggered abilities with intervening if clauses
Theres a lot of ways to break these, like running creatures that create multiple bodies, but having to include these in certain build-arounds holds them back a bit
Most people nowadays know Karn as a Planeswalker, but back in the day he was a normal silver golem