Big-picture things I want to keep in mind:
Back away from 'value' or 'spell' creatures.
Persistent or triggered abilities should primarily be on enchantments.
Activated abilities can be on creatures and artifacts.
No +1/+1 or -1/-1 counters, only thaw counters.
For creatures, each color should have an 'aggressive' keyword and 'defensive' keyword, and pairs should have one of each from the pool.
Planeswalkers? Not sure yet. Domri Rade?
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