Rottenmouth Viper [Bloomburrow Prerelease Promos] Metal [x2] put a +1/+1 counter on

put a +1/+1 counter on target creature you control

Set: Bloomburrow Type: Creature — Elemental Snake Rarity: Mythic Cost: {5}{B} As an additional cost to cast this spell

Set: World Championships 2009 Type: Water Rarity: Promo Retreat cost: Colorless

Set: Sword & Shield: Crown Zenith Type: Darkness Rarity: Ultra Rare Retreat cost: 2

You can only use each effect of "Firewall Dragon Singularity" once per turn

Rottenmouth Viper [Bloomburrow Prerelease Promos] Metal [x2] put a +1/+1 counter onSet: Bloomburrow Prerelease Promos 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