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Playing lands is pretty much nonoptional even the Oops, All Spells decks run lands in the form of MDFCs

This is an ability most likely to see play in formats where you can make your creatures unblockable and protect them, which means its big for Commander, but probably wont see much use elsewhere

In a format as slow as this, I still think Thoughtseize is the better card, but formats change

As showcased by Isu the Abominable, these cards spell out exactly what you should be doing

Wizards is still making them just about every set (the Stupid Auras Division annoys me greatly), so if you dont like some of these choices, wait for next set, and they can come off

That way, you can activate the ninjutsu ability once blocks have been declared to bring in one or more ninjas depending on how many unblockable creatures you attack with