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Weakness: [Fire] x2 Retreat Cost: [Colorless] [Colorless] [Colorless] [Colorless]
If I'm struggling to get my commander into play, but I've got lots of Spider-folk around, Spider-Mobile gives me a potential attacker with base stats of 3/3, Trample, and +1/+1 until end of turn for each Spider I control
Topologic Trisbaena Topologic Trisbaena is a neat way of preventing your opponent from using one of their monster zones
Without her, I'd say this deck is dead - though Dimir still has plenty of strong options, and other ways to draw cards
One of the major drawbacks to doing a sixth color is that we fear that we'll be committed afterwards, because players will have decks based around that color and won't be thrilled by the idea that they won't be receiving any new cards any time soon