Artoria, King of knights

If Artoria, king of knights is cast using both {w} and {b}, sacrifice it.
If {b}{b} were used to cast Artoria, King of knights
transform it.
Vigilance, Lifelink.
{t}{w}{w}{r} Artoria king of knights deals 4 damage
to target player or planeswalker.
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"our king is the most pure" - Sir lancelot