Sekibanki, The Rokurokubi

-1: Multiplicative Head: Create a 1/1 black Sekibanki head token creature with "If this creature dies, deal 5 damage to all creatures on the field"
-5: Twin Rokuro Head: Deal 10 damage to target creature, or destroy target artifact. Sekibanki becomes a 5/5 creature until end of turn
-15: Dullahan Night: Destroy all permanents and emblems on the field. Exile up to 20 cards from all graveyards.