Gravespawn Sovereign hadnt even had a new border printing
Colorless commanders can only include cards with a colorless color identity in their deck, and up until now
With flash, you can cast them at any time
#3 Keeper of the Accord Keeper of the Accord is one of the better catch-up cards in white
Incapsula incident ID: 562000120611340026-1630742594918155062
Thanks to Lurrus of the Dream Den, you can cast all of your spells, use Lion's Eye Diamond to make three mana, use that mana to cast Lurrus of the Dream Den as your companion, and immediately recast Lion's Eye Diamond thanks to Lurrus's static ability, which means the floor of Lurrus in a deck like ANT is upping the storm count by two, which is probably enough for Lurrus to steal a sideboard slot all by itself