Throne's Guard

Bestow {4}{w}{w} (If you cast this card for its bestow cost,
it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
First strike, Vigilance
Throne's Guard can only enchant legendary creatures. Enchanted legendary creature gets
+4/+4, and gains first strike and vigilance.
Throne's Guard or enchanted legendary creature
can block two creatures per combat.