This decision was actually more of a long time coming, to be frank, as Golos decks have been pervading the metagame for a fair time longer than just Mythic Championship V, as Bleeding Cool has reported
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Ulamog, the Defiler Ulamog, the Defiler is a giant beatstick that has a significant ward ability, so its hard to kill and will nuke half of someones library on entering
In particular, you can truly see how many different ways a game can go with some ending quite quickly and others getting dragged out for various reasons
(Assuming the Red/Blue Loop has already been utilized): Tribute another "Six Samurai" monster (Always leave a "Shinai" on field while looping), target the desired card and destroy it