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I like to use Spreading Seas and Lord of Atlantis for the Islandwalk. In the meantime I use Summon the School to bring many Merfolk tokens out and combine it with Judge of Currents to gain lots of life and then untap all of them with Merrow Commerce. Once I have enough Merfolk I start to snipe out opponents creatures with the Silvergill Douser + Merfolk Thaumaturgist combo. If all of my good merfolk are being knocked out I can stall the game by using my tokens with Opposition and playing enchantments like Ghostly Prison and Propaganda. If someone wipes out the board you can slowly bring some of your merfolk back with Sun Titan.
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