Merfolk are slippery creatures, and you'll use that to your advantage in the “Merrow Riverways” deck. Plenty of Merfolk, like Streambed Aquitects and Silvergill Douser, have abilities that cause them to tap. Others, like Drowner of Secrets, let you tap any of your Merfolk. Combine them with cards that untap your Merfolk, such as Merrow Commerce and Stonybrook Angler, and you'll start swimming circles around your opponent.

What can you accomplish? Attack and block with the same creatures. Use the same ability multiple times a turn. Return Summon the School to your hand over and over. Keep tapping and untapping Fallowsage to draw cards—and gain more life with Judge of Currents. With so many tricks up your sleeve, how can you go wrong?