Rottenmouth Viper [Bloomburrow] GRN Benalia has a complex caste

Benalia has a complex caste system that changes with the lunar year

Set: Secret Lair Drop Series Type: Enchantment Rarity: Rare Cost: {1}{G}{U}{R} You may play an additional land on each of your turns

Set: Commander Anthology Type: Enchantment — Aura Rarity: Rare Cost: {2}{G} Enchant permanent

the sweeter the taste

Rottenmouth Viper [Bloomburrow] GRN Benalia has a complex casteSet: Bloomburrow Type: Creature Elemental Snake Rarity: Mythic Cost: {5}{B} As an additional cost to cast this spell, you may sacrifice any number of nonland permanents. This spell costs {1} less to cast for each permanent sacrificed this way. Whenever Rottenmouth Viper enters or attacks, put a blight counter on it. Then for each blight counter on it, each opponent loses 4 life unless that player sacrifices a nonland permanent or discards a card.