The simplest is to just make everyone draw cards (including you!), and that can be a spell or a permanent, like the venerable Howling Mine
Like most Magic: The Gathering cards, the value of Rapid Prototyper depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Unstable)
While Mirri is tapped, there's no restriction on how many creatures can attack planeswalkers you control or battles you protect
Have you ever made a custom Magic card
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Since Syrix is in Rakdos colors, you can include other reanimation spells to help speed up the return of your phoenixes and help trigger Syrixs ability