Silent-Blade Oni [Commander 2018] Tenth Edition Promos Set: Limited Edition Alpha Type:

Set: Limited Edition Alpha Type: Sorcery Rare Cost: {X}{B} Target player discards X cards at random

Set: Hour of Devastation Promos Type: Artifact Rare Cost: {3} {2}: Mirage Mirror becomes a copy of target artifact

so does the Nightmare's rage and terrifying strength

Unfortunately

Silent-Blade Oni [Commander 2018] Tenth Edition Promos Set: Limited Edition Alpha Type:Set: Commander 2018 Type: Creature Demon Ninja Rare Cost: {3}{U}{U}{B}{B} Ninjutsu {4}{U}{B} ({4}{U}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Whenever Silent Blade Oni deals combat damage to a player, look at that player's hand. You may cast a spell from among those cards without paying its mana cost.