Collision // Colossus

Ground-based Gruul aggro has one perennial hole in it: a single well-timed flyer can invalidate a whole board built to swing wide and low, and narrow anti-air hate is exactly the kind of dead maindeck card an aggressive deck can't afford. These two halves solve that problem by folding the answer and the finisher into one slot. Collision is a hyper-specific antiair spell, six damage aimed only at a creature with flying, an overkill number that exists precisely because flyers are what a beatdown deck otherwise cannot interact with. Colossus is the closer, a +4/+2 trample pump that turns a stalled attacker into lethal. Neither half wants the same board state, which is what makes the card impossible to leave stranded: it's insurance against the sky that becomes a proactive kill spell the moment the sky isn't the problem. The mana costs encode the split's logic cleanly. Collision's hybrid lets either color cast the removal, so the answer stays cheap and splashable; Colossus demands both and , committing fully to Gruul for the payoff. It's an economical way to buy flexibility without diluting the aggressive plan: the anti-flyer half is never truly narrow because the pump half is always waiting behind it.