Unleashed Demon

Ritual -- Sacrifice an artifact (You may sacrifice an artifact and a creature rather than pay this spell's mana cost)
Flying, trample
Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It cannot block
as long as it has a +1/+1 counter on it.)
When Unleashed Demon enters the battlefield, if its Ritual cost was paid, it gains haste until end of turn.