Silent-Blade Oni [Planechase Anthology] Valla Whenever you cast a Merfolk

Whenever you cast a Merfolk spell

Set: Wizards Play Network 2011 Type: Artifact Creature — Pest Rarity: Rare Cost: {1} Battle cry (Whenever this creature attacks

Tap all untapped permanents of the chosen type target player controls

Set: New Phyrexia Type: Artifact Creature — Phyrexian Insect Rarity: Rare Cost: {1} {X}{B/P}: Remove up to X counters from target permanent

/ But Cao Cao's vanguard

Silent-Blade Oni [Planechase Anthology] Valla Whenever you cast a MerfolkSet: Planechase Anthology Type: Creature Demon Ninja Rarity: 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.