Surprise MTG Pauper ban drops before Modern Horizon 3 spoilers start

Wizards of the Coast dropped a surprise Magic: The Gathering Banned and Restricted announcement on May 13 for the Pauper format, banning the Enchantment Aura All That Glitters. 

The last MTG Banned and Restricted announcement dropped in March, while the December ban included five cards, of which Karn, the Great Creator, and Geoligical Appraiser were removed from the Pauper format. Leading up to the release of Modern Horizons 3 (MH3), WotC used the May 13 B&R window to remove All That Glitters from the Pauper format.