If an attacking creature you control goes unblocked, you can reveal a card with ninjutsu from your hand, pay the ninjutsu cost, and return that attacking creature to its owner's hand
Hence, if 3 was chosen, Haktos can be destroyed by Murder but can't even be targeted by Heartless Act
If you had a typal card, we wanted you to be excited to play it and not have to worry if it might help your opponent more than you
Its always nice to see it show up in a Masters set or a flashback set, but you dont see it in Constructed formats as much anymore as there are just better options
This would likely go under the radar, as were already playing in the space of Human tribal and it would allow for a misdirection as people will expect that you intend to meld into [casthaven]Hanweir, the Writhing Township[/casthaven]
Of course, the main appeal is reducing the X-cost that's often associated with hydras