All Standard-legal sets from Return to Ravnica forward are legal in Pioneer. That means if you your old Standard deck was legal at any time after September 27th 2013, it’s legal in Pioneer, unless any of its cards are on the Pioneer ban list.
The current ban list is as follows:
Field of the Dead
Inverter of Truth
Kethis, the Hidden Hand
Leyline of Abundance
Lurrus of the Dream-Den
Nexus of Fate
Oko, Thief of Crowns
Once Upon a Time
Teferi, Time Raveler
Uro, Titan of Nature’s Wrath
Veil of Summer
Winota, Joiner of Forces
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