Bliziak the dark striker

[serosage]

 

1 Tuner + 1 or more non-Tuner monsters

When this card is Synchro Summoned, You can send 1 "Shadowslayer" from your Deck to the Graveyard. This card can attack your opponent directly. Once per turn, You can change all monsters on your opponent's side of the field to face-down Defense Position. By paying 500 Life Points, select 1 "Shadowslayer" from your hand or Deck, and Special Summon it to your side of the field.

[BFlaherty13]

looks good but next time include shadowslayers with it to show the full extent of its power

[Angel of Silence]

It's a bit OP'd. Pic is good. 8.5/10

[ragnarok1945]

atk is somewhat on the low end, effect is fine though

 

9/10

[Zeaux]

My suggestion

 

When this card is Synchro Summoned, can send 1 "Shadowslayer" from your Deck to the Graveyard. This card can attack your opponent directly. Once per turn, you can flip 1 face-up monster your opponent controls to face-down Defense Position. Once per turn, you can pay 500 Life Points to Special Summon 1 "Shadowslayer" from your hand or Deck.

 

Now it is balanced :D