Robe of the Archmagi

The tribal equip discount is the whole reason this exists. Combat-damage-to-cards effects have always been a Faustian bargain: the payoff scales with an unblocked evasive body, but the equip tax means you spend a whole turn assembling the engine before it draws you anything. Robe of the Archmagi cuts that setup cost to a single mana for a Shaman, Warlock, or Wizard, which is a targeted concession to a spellcaster shell that rarely fields the kind of oversized, evasive beater this card wants. That mismatch is the design's actual tension: the discount rewards the very creature types least likely to connect for a large number, so the payoff is real but the assembly is on you. Compared to the older draw-on-damage equipment in this lineage, the effect here is uncapped rather than a fixed trigger, meaning the reward is entirely a function of how much power you can push through unblocked. Get a large, unblockable Wizard across and the refill is enormous; leave it on a 2/2 and it draws you a pittance while a removal spell threatens to strand your investment. It reads as pure upside because the downside is invisible until an opponent blocks or kills the wearer, at which point the mana you sank into equipping evaporates with nothing to show for it.