River Boa [FNM - 249] SWSH038 You start the bidding with

You start the bidding with a high bid of 1

the first sorcery spell

Sacrifice Engineered Explosives: Destroy each nonland permanent with converted mana cost equal to the number of charge counters on Engineered Explosives

[-5]: You get an emblem with "Mountains you control have 'T: This land deals 1 damage to target creature or player

River Boa [FNM - 249] SWSH038 You start the bidding withRarity: P #: 249 Creature Type or Sub Type: Creature Snake P: 2 T: 1 Rules Text Contains: Islandwalk (This creature is unblockable if defending player controls an island.) G: Regenerate River Boa. Flavor: "But no one heard the snake's gentle hiss for peace over the elephant's trumpeting of war." Afari, Tales