«أَكْرِمْ بِهِ أَصْفَرَ رَاقَتْ صُفْرَتُهُ»
How admirable is the yellow thing whose color appears pleasing!
«تَبًّا لَهُ مِنْ خَادِعٍ مُمَاذِقِ»
But shame on it as a deceptive flatterer!
The first line gives an impression of admiration; the next turns to blame for deception. The shift from positive to negative appraisal is the defining mughayarah. It highlights the contrast between attractive outward appearance and actual effect.