Brackwater Elemental (DDH) from Duel Decks: Ajani vs. Nicol Bolas, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Thomas M. Baxa
• Card Text:
  When Brackwater Elemental attacks or blocks, sacrifice it at the beginning of the next end step.
  Unearth 2U (2U: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)