Dark Summonings

Have three or more of the following at once:
Someone has six cards in hand, controls six nonland permanents, controls six lands, has
six cards in their graveyard, has six cards in exile, has six life, a planeswalker has six loyalty, a creatures power is six, a creatures toughness is six, a spell on the stack has a
mana cost of six, a permanent has a mana
cost of six, or find something else that is six.