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Why Mutagenic Growth?I suggest a counter spell (4x Mana Leak)
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a lot of times in a merfolk deck, you'd not want to drop that mana leak until you run out of cards in hand. Why? Because you want to spawm your lords and other merfolks to get the aggro going. By the time you have enough mana to save for that mana leak it would be pretty much obsoleted. I'd suggest something that doesn't require them to tap mana. Cancel or just counterspell would be a much better choice for merfolk with this many lords.
lol. When playing tribal, there's always a wrath spell waiting to make you sad.