The Dark Paladin

When Dark Paladin enters the battlefield,
sacrifice creature cards you control with the
name Buster Blader and The Dark Magician. If
you don't, sacrifice Dark Paladin.
Whenever an opponent casts an instant spell, you
may discard a card. If you do, counter that spell.
Dark Magician gains +1/+0 for each dragon on
the battlefield and in all graveyards.