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Start with the amount of damage being dealt to the creature and determine what is "lethal." This is usually the creature's toughness minus the amount of damage that it already has marked on it, but ignoring any replacement or prevention effects that will modify this damage

Usually, SEC cards are placed at the very end of the set numbering

This powerful green creature turns damage done to your creatures into +1/+1 counters for them

Another way would be to include example decks from competitions and current metagame, such that the system can learn from these and build decks that are more competitive, or focus on beating existing strategies

It's messy