Zoraline, Cosmos Caller Zoraline, Cosmos Caller strikes me as the kind of bat commander you fiddle around with and get some sweet value from before realizing that youre playing with small permanents while your opponents slam Etali, Primal Conqueror and various Eldrazi
Prosper, Tome-Bound ( Adventures in the Forgotten Realms Commander) Prosper hopes to earn power and wealth on his adventures
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If you pick Clara Oswald as your Doctors companion, you can add black to your color identity and run some sweet Food synergies, including historic ones like Gyome, Master Chef
Blues combat tricks focus on making creatures bigger, like Serpentine Ambush and Wings of Velis Vel
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Icebreaker Kraken)