MANAHIVE

There are no emblems exactly equivalent to Chandra, Roaring Flame Emblem (colorless, Chandra, dealing 3 damage to you on upkeep).

However, the closest in mechanics (emblems, colorless, with a recurring damage/loss of life effect) is Ob Nixilis Reignited Emblem (colorless, Ob Nixilis):

• Ob Nixilis Reignited Emblem: Whenever a player draws a card, you lose 2 life.

Both are colorless emblems that cause recurring detrimental effects to a player, but none other deal 3 damage to you at upkeep.