Rottenmouth Viper - Foil Condition:Excellent Whenever Rootwater Thief deals combat

Whenever Rootwater Thief deals combat damage to a player

it gets +1/+1 until end of turn for each opponent you attacked this combat

Infiltration Lens

They often join Wars of Faith – though it is not unheard of for a Ministorum Priest to lead one

Crypt Sliver

Rottenmouth Viper - Foil Condition:Excellent Whenever Rootwater Thief deals combatRottenmouth Viper Creature Elemental Snake As an additional cost to cast this spell, you may sacrifice any number of nonland permanents. This spell costs less to cast for each permanent sacrificed this way. Whenever this creature 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 of their choice or discards a card. Set: Bloomburrow promos