Mox Opal [Scars of Mirrodin] Bird but my host would casually

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

They don't untap during their controller's next untap step

remove a scream counter from it

Set: Unlimited Edition Type: Creature — Human Assassin Rarity: Rare Cost: {1}{B}{B} {T}: Destroy target tapped creature

Set: Revised Edition Type: Land — Plains Swamp Rarity: Rare ({T}: Add {W} or {B}

Mox Opal [Scars of Mirrodin] Bird but my host would casuallySet: Scars of Mirrodin Type: Legendary Artifact Rarity: Mythic Cost: {0} Metalcraft {T}: Add one mana of any color. Activate only if you control three or more artifacts. The suns of Mirrodin have shone upon perfection only once.