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Being able to hold up mana to interact and then dump it into casting something outside of normal timing restrictions is incredibly powerful in Commander, so I definitely think that this card will be a big hit in the format

For seven mana you get a 7/5 artifact creature that is hard to block thanks to menace and helps stabilize you with lifelink

BPhillipYork: This is really neat card design, complicated, but make sense, and works okay

This means if your opponent casts a spell that involves a coin flip, you have to decide how likely it is that the result of the flip will have an effect on the game and whether or not you should do something about it