Shadowblade

When Shadowblade comes into play, sacrifice two creatures or bury Shadowblade. Then put on Shadowblade an amount of Soul tokens equal to the cumulated Toughness of both sacrificed creatures.
{p/b}{p/b},{t}: Bury target creature with Toughness lower or equal to the amount of Soul tokens on Shadowblade. Then remove two Soul tokens
from Shadowblade. If you can't, return Shadowblade to Owner's hand.