Canoptek Wraith
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Similarly, if its controller changes in the middle of combat, it is removed from combat
One other card that works similarly is Seizan, Perverter of Truth
Devastation might be a more reliable effect for your 7 mana as then you can rely on it as a wrath effect and it does not ruin your artifact ramp synergy as Obliterate effects do
There was a lot of theorycrafting in the cEDH community that focused on how to know what number to pick in order to draw the most cards