This is especially true for Commanders that want to cast massive spells like Ovika, Enigma Goliath
Add some lands and you're ready for epic 2-player battles EXPLORE MIDDLE-EARTH33% of Draft Boosters contain a Land card featuring a Full-Art map of 1 of 10 different Middle-earth locations
Left unchecked, they quietly win the game through sheer inevitability
Or really any reason
The same is true if an opponent's permanent gains one of those abilities after Shay Cormac's first ability resolves
W for a 1/1 (So far, so good.) 2W for a 2/2 (Pearled Unicorn, but not horrible.) 10W for a 5/5 first strike creature (Wait, what?) 1U for a 0/3 (Eh, but bearable.) 3U for a 0/6 (Getting pretty bad here.) 11U for a 6/6 islandwalk creature (Wait, what?) B for a 1/1 (Muck Rats, but okay.) 4B for a 3/3 (Looking a little worse here.) 12B for a 5/5 creature with pseudo-fear (Wait, what?) Those ultimate mana costs were paid out over multiple turns, but if your creature died before hitting their highest level game over, tons of wasted mana, yikes