Discover your true self under the perpetual moonlight of this dual-aspect plane
With the addition of Mew ex, you can not only add Psychic damage to any deck, but you can also copy some of your opponents best Moves
It creates three bodies for Aristocrats
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
This rule has a number of applications
Feed the Swarm is helpful to have enchantment removal in Dimir