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SeaSerpent/Effect

Even Wizards of the Coast knows its power, originally posting the information on Conspiracy in a coded cipher, teasing us with information we had to work for in order to figure out

He can be inserted into just about any deck and deliver 30 damage turn after turn

Luckily, given the prevalence of enchantment cards, these are much harder to remove than creatures so Miracle Worker is less vulnerable to board wipes than most, and Aminato's ability to surveil and give enchantment cards miracle does mitigate a lot of the top deck luck required to get it running

The downside is the opponent chooses which permanent they sacrifice of the chosen type, not you