What's a Bolas Boast?
“I’ve survived hundreds of lifetimes… I’ve survived more apocalypses than you’ve had chest colds. I’ve experienced more of this cosmos than any being there has ever been. And you think you’re going to stand in my way, matchstick? You think you’re the one to finally take me down? I can tell you now, if Nicol Bolas is to fall, it won’t be because of the likes of you.”
“I was old before this world was even born. I watched my brothers rule for a thousand years until little worms like you overcame them. But I am not my brothers. I am older than they are, greater. I have devoured stars and shattered worlds. I have sired whole races, populated entire planes, and then hunted them to extinction for my amusement. I have bathed in the blood of gods and used their bones to build my nest. I am the mind-ripper, the deathbringer, the winged dark that terrifies your dreams. I was the first to witness the sun rise on this world, and I will be the last to watch it set for the final time. I have no beginning and no end. I have always been, and I shall always be. My name is the foundation of all that is, and those who hear it will obey or become as nothing…I am Nicol Bolas… Planeswalker, elder dragon, the oldest and most powerful being that has ever or shall ever exist.”
The two I know of. By now I know the second one by heart.