Library ninjutsu ability can be activated only while you're searching your own library and only if you control at least one unblocked attacker
The impending mechanic means it can provide land acceleration and mana fixing as early as turn three, and it can continue to provide value when it attacks after becoming a creature four turns later
Plus, since they're all only one color, it'll hopefully lead to straight forward gameplay, since you won't have to worry about mana fixing
(For a similar free-haste effect, see Xenagos, God of Revels)
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It can only be blocked by legendary creatures, so its more likely to trade with a commander or another big, scary threat