Rebeca The Empress

Hexproof
{t}add: {b}{g}
When Rebeca the Empress enters the battle field summon all Knight creatures in every graveyard under your control with covert mana cost {x} or less.
This cards power and toughness are equal to the amount of Knights you control.
When Aronox the Emperor is on the filed this card gains, Indestructible.
"None shall harm her while I stand." as decreed by the Emperor