Tribal Golem

Five tribes (Beasts, Goblins, Soldiers, Wizards, Zombies), five abilities, and a single colorless 4/4 that hands you exactly one of them per tribe you control. Drop it in a focused mono-tribal shell and it gets one ability for free, a fine but unremarkable bonus. Drop it into a sprawling five-color pile and it suddenly tramples, flies, has haste and first strike, and regenerates on a black mana, every ability switched on at once. That is the joke buried in the cost: 4/4 for six is a deliberately weak rate, because the body is priced for the ceiling and the ceiling only arrives when your board is a scattered mess of creature types. A deck disciplined enough to lean on one tribe gets the least out of it; the wide, unfocused goodstuff deck the tribal theme was supposed to discourage gets the most. The card reverses its own era's incentive, rewarding breadth in a structure built to reward depth, and it scales not with how good your creatures are but with how many directions your board points at once. In practice it lived in colorless toolbox slots picking up one or two keywords and shrugging at the rest, an honest payoff for a deck nobody was quite incentivized to build.