Arguel's Blood Fast // Temple of Aclazotz

{1}{B}, Pay 2 life: Draw a card. At the beginning of your upkeep, if you have 5 or less life, you may transform Arguel's Blood Fast. --- (Transforms from Arguel's Blood Fast.) {T}: Add {B}. {T}, Sacrifice a creature: You gain life equal to the sacrificed creature's toughness.