Vazi, Keen Negotiator

A group-slug card that weaponizes generosity: it hands opponents resources precisely so it can punish them for spending those resources. The tap ability gives a target opponent Treasure equal to what you made that turn, and the trigger cares whether an opponent spends Treasure mana, converting their extra ramp into a +1/+1 counter and a card for you. That engine is genuinely unusual, because it does not merely tax opposing behavior; it manufactures the behavior first, then collects on it. Both halves lean on you being the Treasure hub at the table, so the card asks for a build that overflows tokens and then donates the excess as bait. The trigger fires on spells and activated abilities alike, a wider net than most "when an opponent casts" designs, and it does not care who the Treasure came from, only that Treasure mana touched the cast or activation. Haste on this five-mana Jund body matters less for beatdown and more for getting the tap online the turn it lands, since the giveaway is the whole reason to run it. It belongs to a small family of donation-and-reward pieces where the payoff is behavioral rather than damage-based, closer in spirit to symmetric-mana giveaways than to a straightforward aristocrats or Treasure-sacrifice payoff.