Hylian Gold Guard

Hylian Gold Guard gets +1/+1 for each other
Knight you control.
Purity {w} - Gain 1 life for each other Knight
you control.
Purity {g} - Put a trample counter on Hylian
Gold Guard.
(When this card is cast, if its cost was paid using
mana of only one color, activate the Purity effect of
the color of mana spent.)