Silent-Blade Oni [Commander 2018] Tenth Edition Promos if an opponent has more

if an opponent has more life than you

Set: Legends Type: Legendary Land Uncommon Cost: {T}: Add {G}

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

Set: Kaladesh Promos Type: Legendary Creature — Elf Druid Mythic Cost: {2}{G}{U} Whenever you cast your first spell each turn

Unfortunately

Silent-Blade Oni [Commander 2018] Tenth Edition Promos if an opponent has moreSet: 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.