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Here we have it! The RNN generated an explanation for tromple, and it turns out it's the Slith ability. It's a pretty aggressive card for white, but it's ability to pump itself up, and draw cards when it dies (or when other creatures with +1/+1 tokens on it die) make it incredibly versatile.
Once again, perfect flavor. It's red, and has tromple, persists once, and flies because it's a dragon.