The mid game and late game are all about survival, accumulating permanents with triggered mill abilities like Ruin Crab and Memory Erosion, play instants and sorceries that mill some more like Mind Grind, and play spells that benefit greatly from the resulting increase in graveyards like Guiltfeeder and Avatar of Woe
Theyre even more dangerous outside the arena
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So, mark your calendars to see it all
It doesn't have to be attacking the same player, planeswalker, or battle that the non-Human creature is attacking
An evasive threat that makes short work of your opponents, its at its best in control shells that let the game go long enough for the 5-mana activated ability to be relevant