Silent-Blade Oni [Planechase Anthology] Horror put a -1/-1 counter on

put a -1/-1 counter on each creature your opponents control

the Warleader attacks for the first time each turn

Rip it out

"True riches are found in the mazes of the mind

Search that player's library for that many cards

Silent-Blade Oni [Planechase Anthology] Horror put a -1/-1 counter onSet: 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.