Mask of Intolerance

The block this came out of was built to sell multicolor abundance: dual lands, gold cards, manabases that did anything you asked. Mask of Intolerance reads that abundance as a liability and charges rent for it, ticking three off the top of anyone whose lands span four or more basic types. The genius is the trigger condition. It does not care how many lands you control or what you cast; it cares only that your fixing has gotten too good, which means the people most likely to bleed are exactly the ones running the smooth five-color bases the era was pushing. It is a hoser aimed inward at the very paradigm it shipped alongside, a designer's wink that the gold-card dream had a tax attached. The symmetry and timing are precise: the damage lands at the start of each player's own upkeep, after that player has untapped but before they draw, so a greedy manabase has its lands available but still pays the toll every turn before doing any work for the cards it draws. Two generic mana buys a clock its controller sidesteps entirely by playing a disciplined two- or three-type base. As color-pie philosophy it is unusually pointed: the cost of playing every color is three life a turn, payable to whoever was willing to play fewer.