It's like the Marvel Zombies arc - every one the dragons lose is one Lin gains. It's not a war of attrition because Lin doesn't lose combatants. Lin is creating a positive feedback loop, which is the general systems-theory term for any process where the output of an event reinforces the same process, causing the effect to accelerate rather than stay linear.
That's the mathematically precise label for what's happening: each kill doesn't just subtract from the dragon army, it adds to Lin's, so the rate of change itself is increasing. It's not just heavy losses, it's accelerating losses for the dragon clan while at the same time accelerating gains for Lin.
Lin may not have been guaranteed a defining win originally, but with this broken skill, he can turn any fight, regardless of how out classed he might be, into a numerical advantage, and eventually win, just by showing up.
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"I'mma let you finish, but first I wanna say that EvilSupahFly has the best signatures. OF. ALL. TIME!"
Kanye West, 2009 Internet Signature Awards