Rottenmouth Viper [Bloomburrow Prerelease Promos] Metal [x2] You can only use each

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

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

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

except "Tearlaments Reinoheart"

or sent to the GY: You can target 1 Cyberse monster in your GY

Rottenmouth Viper [Bloomburrow Prerelease Promos] Metal [x2] You can only use eachSet: 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