If your Commander opponents have spent the first handful of turns casting mana rocks and ramping, you can set them back significantly with a large Rampaging Yao Guai
Toph, the First Metalbender and Fire Lord Zuko are in similar positions to each other
Thassa, Deep-Dwelling + Teleportation Circle Magic is flooded with powerful ETB abilities these days
When it comes into play, you get to pick one of those many, many creature types to be specific for Realmwalker
As a result, Golgari Grave-Troll has been the engine of Dredge decks across formats and holds a record of being the only card to have been banned in Modern two different times, with it originally being on the first Modern ban list, only to be unbanned in January 2015 and then banned again two years later in January 2017
This four-mana Merfolk gives you a ton of Wave tokens when it comes into play, though they are just little 1/0s that cant stick around once Master of Waves leaves