True that God has infinite attributes that most of them could be used at the beginnings, for a blessing, but MERCIFUL is used and emphasized here for its universal effect and light, that covers all creatures and creations, which may save those entangled in difficulties. Let us hear this from God Himself in HIS HOLY BOOK:
``He (i.e. GOD) said: ``I will afflict with my punishment whom I will. But My MERCY extends to everything. Soon I will ordain that MERCY for those who avoid evil deeds, and pay their due alms-tax, and those who believe in our signs.''
QURÄN - S 7:156
We even see the prophets, such as HUD, grasping to the Mercy of God, when they are in trouble and hardship, in order to be rescued:
``We saved HIM, (HUD) and those who adhered to him by OUR MERCY, and we cut off the roots of those who rejected our signs, and were not believers.''
QURÄN - S 7:72