Silent-Blade Oni 241 (Commander: Outlaws of Thunder Junction) Riftbound League of Legends Whenever you cast a permanent

Whenever you cast a permanent spell with a mana cost that contains {X}

create a 1/1 white Cat creature token

Sacrifice the creature at the beginning of the next end step

Activated abilities of creatures you control cost {2} less to activate

Silent-Blade Oni 241 (Commander: Outlaws of Thunder Junction) Riftbound League of Legends Whenever you cast a permanentNinjutsu {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 this creature 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.