Brazen Collector

The clever part is the second sentence of the trigger: mana burn has been gone from the game for years, so the ritual attackers of old (Savage Ventmaw, various combat-mana creatures) always faced the phase-boundary problem, where mana added in the combat step vanishes before you can spend it in the second main phase. This raccoon writes the fix directly onto the card. The red it produces on attack survives the transition out of combat, so a swing on turn three feeds directly into a fourth or fifth mana of spells afterward, turning a single attack into a repeatable Rite of Flame that gets to poke for two with first strike on the side. That first strike is not decoration: it protects the 2/1 body across the block step you are attacking through, keeping the mana engine alive against the small blockers it would otherwise trade with. The result is a creature that reads like an aggressive two-drop but functions as an attack-triggered ramp piece, best in a deck that wants to curve out and then dump the extra red into burn or a large-cost payoff the same turn. The constraint is honest: no attack means no mana, so it only pays out when it is already doing its aggressive job, which keeps it from becoming a static rock that sits back and accelerates.