Symmetra

When Symmetra enters battlefield create three
1/1 blue Turret creature tokens. They have
"Defender and Reach." This effect triggers only if
Symmetra is casted from hand.
{t}: Create 1/1 blue Turret creature token. It has
"Defender and Reach."
{t}{u}{u}: Symmetra and all Turret creature tokens
attack a single non-flying target creature.
Those creatures fight each other.
(Each deals damage equal to its power to the other.)