Ravenous Desert

{t}: Add {c} to your mana pool. If a creature died this turn you may instead add mana of any colour to your mana pool.
{3}{c}{t}, Sacrifice Ravenous Desert: Each player sacrifices all creatures they control tied for the lowest toughness among all creatures. Gain 1 life for each creature that died this turn.
"This wasteland is possessed of a hunger than can never be sated." - Nalia, Archmage of the Grove