The Fate of the Flammable (Schemes) [Archenemy Schemes] Swamp Set: Lorwyn Type: Tribal Enchantment

Set: Lorwyn Type: Tribal Enchantment — Merfolk Rarity: Uncommon Cost: {1}{U} At the beginning of your end step

Set: Rivals of Ixalan Prerelease Promos Type: Legendary Creature — Elder Dinosaur Rarity: Rare Cost: {5}{U}{U} This spell can't be countered

Summoned from the dreamrealms

but my host would casually push it down before I could make out what it was

The Fate of the Flammable (Schemes) [Archenemy Schemes] Swamp Set: Lorwyn Type: Tribal EnchantmentSet: Archenemy Schemes Type: Scheme Rarity: Common When you set this scheme in motion, target opponent chooses self or others. If that player chooses self, this scheme deals 6 damage to that player. If the player chooses others, this scheme deals 3 damage to each of your other opponents.