Day's Undoing only counts as one card drawn
Day's Undoing only triggers one draw instead of seven, for example, Chasm Skulker only gains one +1/+1 and Ominous Seas only gains one foreshadow counter.
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Hello,
It sounds like you may need some more troubleshooting advice, please submit at: https://mtgo-support.wizards.com/hc/en-us/requests/new and select 'Technical Troubleshooting'.
Thanks!