Tribute 1 "Ninja" monster to target 1 monster your opponent controls; banish that target. While that card is banished, its Monster Card Zone cannot be used. When this face-up card leaves the field: Return the card banished by this effect to the same Monster Card Zone, in the same battle position.
By using A Cat of Ill Omen's flip effect, you can search Ninjitsu Art of Shadow Sealing from your deck and put it on top of it.
Tributes for cost / Returns from Banished Zone to field
Banishes from your opponent's field
Restricts Monster Zones
This card needs to be at least Semi-Limited. Seriously, most people don't run anti-backrow to negate this card. As there's only three monster zones, this thing is too OP to be unlimited. It's almost as bad as Yata-lockdown was back in the day in the TCG. Actually, this card makes me wish that we had Link Summoning in Duel Links. That way we could at least get an Extra Deck monster out and not be locked out.