Kurra Blood-Blade

As long as you own three or more white permanents, Kurra Blood-Blade gets +2/+2 and has vigilance and first strike.
As long as you own three or more red permanents, Kurra Blood-Blade gets +2/+2 and has trample and lifelink.
"She's a traitor and a thief, but she's the best soldier we have."
- Brigid, Hero of Kinsbaile