Cyber Summon Blaster

Continuous Trap

Each time a Machine monster(s) is Special Summoned, while this card is already face-up in your Spell & Trap Zone: Inflict 300 damage to your opponent.

Rulings – Yugipedia

Printings:

Power of the Duelist: POTD-EN057 (Rare) - 2006-08-16
Power of the Duelist: POTD-EN057 (Ultimate Rare) - 2006-08-16
Duelist League 18 participation cards: DL18-EN017 (Rare) - 2014-06-27
Structure Deck: Mechanized Madness: SR10-EN035 (Common) - 2020-04-16

Prices:

Cardmarket: 0.12 €
TCGplayer: $ 0.16