Clone Technique

Ninja cards in your hand have Squad {x}, where
X is its mana cost. (As an additional cost to cast
ninja spells, you may pay {x} any number of times.
When that permanent enters the battlefield, create that
many tokens that are copies of it.)
Whenever you activate a Ninjutsu ability of a
ninja in your hand, you may pay that Ninjutsu
cost any number of additional times to create that
many tokens that are copies of that Ninja.
Ninjas you control have "Ward {1}, Pay 1 life".