Kingfisher, solved.

The Report

1. I.

   Read the board before you spend the hook

   A Level 11 P.E.K.K.A marches down the right lane toward your right Princess Tower. Your whole hand is one card — a Fisherman (3 Elixir) — so there is no damage to trade: the entire puzzle is one placement decision.

2. II.

   Place the Fisherman immediately in front of the King Tower

   

   Drop him centred, just above/in front of your King Tower — not pulled toward either Princess Tower. This is the placement marked in red on the board below. Too far to either side and the hook misses or she re-targets a side tower.

3. III.

   Let the hook drag her into the crossfire

   The Fisherman's hook pulls the P.E.K.K.A toward the centre of your side, well out of her comfortable lane. Once hooked, she retargets onto the King Tower.

4. IV.

   Let three defenses finish her

   Centred, the P.E.K.K.A eats shots from both Princess Towers and the King Tower at the same time. The King Tower — the tankiest building you have — becomes her target and soaks her hits while the combined fire burns her down. The Fisherman usually dies in the process; his job was never to survive.