Knight Goober

Lifelink
When Goober Knight attacks it gets +1/+1 until
end of turn. If the creature it's attacking is
Phyrexian or a Black creature, an additional
+1/+1 Vigilance and Double Strike is added until
end of turn.
{t}{x}{w} Destroy X target token creatures for
each white mana spent to cast this ability. {ut}
Goober Knight if more than 5 tokens were
destroyed this way. Cast only as a sorcery.