Harvest Power

Until end of turn, whenever a player would lose life, if white mana was spent on casting this spell then that player gains that much life; if red mana was spent on casting this spell then that player may destroy target land, if they do then that player sacrifices a land; if black mana was spent on casting this spell then that player may have each opponent lose that much life; if green mana was spent on casting this spell then creatures that player controls gain +1/+1.