Thats one word to describe Kellogg, Dangerous Mind
Additionally, your best payoffs are Blood Artist effects that damage your opponents as your creatures die, which excel at forcing through the last couple points of damage even if your opponents stabilize with blockers
In Amethyst/Steel the one foil Jafar is key, then there are just 7 Illusion cards
Getting an equivalent of a sorcery or instants effect while you also drop a body to block or attack with is what this formats miniscule inch-by-inch advantage generation is all about
Instead, it's the fact that it allows the player to draw two cards when an equipped creature dies that pushes it over the top The potential card advantage is unreasonable for a single mana investment, especially since the -1 to Toughness makes it extremely easy for the player to kill their own creatures on command
Gogo, Mysterious Mime might be one of the most powerful cards for our Rebel Tribal