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:

Balustrade Spy
Bloodstained Mire
Expressive Iteration
Felidar Guardian
Field of the Dead
Flooded Strand
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
Polluted Delta
Smuggler’s Copter
Teferi, Time Raveler
Undercity Informer
Underworld Breach
Uro, Titan of Nature’s Wrath
Veil of Summer
Walking Ballista
Wilderness Reclamation
Windswept Heath
Winota, Joiner of Forces
Wooded Foothills

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