Caparocti Sunborn

The tap is what shapes the whole build. Discover 3 on an attack trigger is a repeatable free spell, but to fire it you tap two untapped artifacts or creatures you already control, converting standing board presence into card advantage every combat. That fee points the deck in one unmistakable direction: you want cheap, disposable permanents that don't mind sitting sideways for a turn. Treasure tokens, mana dorks, servos, thopters, freshly generated Clues, anything the tap can eat without stalling your development. The key wrinkle is that the tapped permanents are spent, not sacrificed, so the natural pairing is generating Clues and tapping them for value rather than cracking them for cards; a cracked Clue is gone before it can pay the cost. The synergy with go-wide artifact and token strategies isn't incidental, it's the reason the card gets built around at all, because the two-permanent fee is nearly free on a board already flooded with fodder. Discover 3 sets a tight ceiling, guaranteeing a nonland hit at mana value three or less, so the reward tracks a lean, fodder-heavy curve rather than a deck of expensive bombs. The trigger goes on the stack the moment it attacks and resolves on its own, independent of whether the body lives through combat; surviving only matters for swinging again next turn. What makes it a natural Boros leader is that it rewards exactly the plays the color pair usually struggles to justify on rate: making a Treasure, deploying a token that would otherwise be spent value. Here those spent resources are the fuel.