So can I just run Oath shell with 4 creeping chill, then have Magister Sphinx as my only creature, powder/mull to get sphinx to bottom, then activate oath one time??
I wondered the same thing when creeping chill was spoiled in the single card thread, but getting Sphinx to the bottom was tough. Now..
Perhaps the probability of a single Sphinx in the opening 7 that you can bury through the mull is still too high.