Kami of Celebration
Two triggers wired in a circle: attack with anything wearing an Equipment or Aura or carrying a counter, and you impulse the top card of your library; cast that card from exile, and a +1/+1 counter lands on a creature you control, which is itself a modification that arms the next attack trigger. That closed loop is what turns a plain 3/3 body into a payoff for the equipment-and-auras attacker deck, which already wants to be stacking modifications onto a wide board. The design reads as red buying card advantage the way its slice of the color pie allows: not by drawing and banking cards the way blue or black does, but by exiling and spending them on the turn they arrive. The counter half quietly softens the usual cost of impulse draw, because casting a spell from exile leaves a permanent +1/+1 on the board even after a one-shot instant or sorcery has resolved and gone; the growth outlives the card that triggered it. There is a real timing wrinkle worth exploiting: the exile trigger fires on the attack declaration, so the impulsed card shows up during combat with the rest of your turn still ahead of it, letting you develop mid-combat or hold up a trick you just found. Both halves reward a swarm of small modified attackers over a single suited-up bomb, since more attackers means more exiles and more legal targets for the counters.
