Eumidian Wastewaker is a rare Creature — Insect Cleric card from Edge of Eternities Commander (EOC), collector number 28. Current market price: $0.26, TCGplayer market prices via Scryfall.
Whenever this creature attacks, you and defending player each discard a card or sacrifice a permanent. You draw a card for each land card put into a graveyard this way. Encore {6}{B}{B} ({6}{B}{B}, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)