Red has a similar effect where it does large amount of damage to all creatures (see direct damage )
The trick is to lean on throwaway tokens like those from Spectral Procession or Midnight Haunting, trading them up for far stronger enemy pieces
The effect of Vital Samba doesnt stack
It doesnt care if the spell is both colors or just one of them
And then I hit upon the idea of making it a white card that rewarded low collector numbers
Dreaming Darkly Dreaming Darkly Glen Elendra Archmage (75k decks, SLD foil $65) Guardian Project (263k decks, RVR Borderless foil $54) Roon of the Hidden Realm (2400 as card, plus 3100 as Commander, no special arts) Soulherder (70k decks, no special arts) Real hard to argue with a premium version of Guardian Project, plus the Archmage and the Herder