Arcane Signet (Foil Etched) [30th Anniversary Promos] P-029 All creatures able to block

All creatures able to block Ochran Assassin do so

Set: Visions Type: Artifact Creature — Construct Rarity: Common Cost: {0} "I have heard terrible tales of black rains

Set: Dominaria Remastered Type: Creature — Goblin Rarity: Rare Cost: {3}{R}{R} When Siege-Gang Commander enters the battlefield

Set: Commander 2021 Type: Instant Rarity: Rare Cost: {2}{U} Whenever a nontoken creature enters the battlefield under an opponent's control this turn

If you sacrificed a creature this way

Arcane Signet (Foil Etched) [30th Anniversary Promos] P-029 All creatures able to blockSet: 30th Anniversary Promos Type: Artifact Rarity: Rare Cost: {2} {T}: Add one mana of any color in your commander's color identity.