For -4, Nicol Bolas can do what dragons do best
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While you would always want Treasure tokens (and you can give yourself them), your opponents will likely be giving you Clue tokens by making you investigate
Theres a lot of flexibility for only two mana to start
Unsurprisingly, the commander is Caesar, Legion's Emperor, who lets you sacrifice a creature to gain two of three benefits when you attack with any creature
But thats when I realized that rats were an okay and viable creature type to build around, and they usually want to be around other rats