Ariados (15/123) [HeartGold & SoulSilver: Base Set] 133 If a monster you control

If a monster you control whose original Attribute and Type are DARK and Machine destroys a monster(s) your opponent controls by battle or by its own effect and sends it to the GY: You can inflict damage to your opponent equal to half the original ATK of 1 of those destroyed monsters in the GY

Set: XY: Base Set Type: Supporter Rarity: Uncommon

and it cannot be Tributed

but they cannot be Tributed or be used as Synchro Material

When this card destroys an opponent''s monster by battle

Ariados (15/123) [HeartGold & SoulSilver: Base Set] 133 If a monster you controlSet: HeartGold & SoulSilver: Base Set Type: Grass Rarity: Rare Retreat cost: Colorless