My first a blessing sent to earth, of plants and flowers to aid the birth; my second surely was designed to hurl destruction on mankind; my whole a pledge from pardoning heaven, of wrath appeased and crimes forgiven.
Answer: Rainbow.
This riddle appears in the following downloadable PDF files:
Can you solve one of the most famous logic puzzle ever?
Memory Matching game for kids, adults and seniors.
Connect the matching tiles and pop them all.