White is for Discoveries and sideboard options
Repeatable removal is powerful even if it's just bouncing a creature to hand, and you may have creatures you want to bounce so you can recast them
Necro-Impotence This card was designed around the name
Whenever an opponent gains control of a permanent from you, you create a Treasure token
With 8 power for just 2RG (two generic mana, one red, and one green), Anzrag is a tremendous threat that any player will be sorry to see tunneling towards them
It plays well in flash shells like Nymris, Oona's Trickster and Alela, Cunning Conqueror, and its a fun reminder to people that firebending doesnt affect the color identity of a card, since reminder text isnt factored into color identity