Rebecca, Desired Home Binder

Vigilance, Mentor
Rebecca gets +1/+0 for each other creature you control with power greater than its base power during combat on your turn.
When Rebecca attacks, if it has power 5 or greater, creatures you control get First strike until
end of turn, then if it has power 10 or greater, prevent all non-combat damage that would be dealt
to creatures you control until start of your next turn.
"Peace must be fought for, I will teach you how."