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Cards like Mental Modulation will help to keep the spell count flowing

Creator Kazuki Takahashi Found Dead in Okinawa Rest in peace to the Game King

These are also the basis for Limited play

If all you want is a Meren of Clan Nel Toth to lead your Commander deck, you're better off just waiting and picking up a copy on the secondary market a month or two from now

You can simply use cards like Infectious Inquiry and Vraska's Fall to spread poison around and sit behind your massive creatures while proliferate cards like Vraska, Betrayal's Sting and Evolution Sage slowly kill your opponents

If not, put the card back on your deck