Dack's Duplicate [Conspiracy] Mx2 creatures can't attack unless their

creatures can't attack unless their controller pays {X} for each attacking creature they control

When Nebelgast Intruder enters the battlefield

Set: The List Type: Creature — Horror Rarity: Rare Cost: {3}{B} As Sewer Nemesis enters the battlefield

Set: Dungeons & Dragons: Adventures in the Forgotten Realms Type: Creature — Elemental Rarity: Rare Cost: {2}{R} If you would create one or more Treasure tokens

Moving without sound

Dack's Duplicate [Conspiracy] Mx2 creatures can't attack unless theirSet: Conspiracy Type: Creature Shapeshifter Rarity: Rare Cost: {2}{U}{R} You may have Dack's Duplicate enter the battlefield as a copy of any creature on the battlefield, except it has haste and dethrone. (Whenever it attacks the player with the most life or tied for most life, put a +1 +1 counter on it.)