card holder with sleeves Bellroy Dimension 11.4×7.8×1.5cm 1085 - Business Card Sleeve

Its [Security] effect activates, adding a card to my security stack

From deck summon Galaxy Serpent 4

If any card (in this case Blue Eyes) attacks any of your cards, its attack is cut in half, making a Blue Eyes ATK 1500

They never need to be fully replaced, meaning that upgrades and efforts to make them duel-ready are inexpensive over the cost of building a whole new deck

You can only use this effect of "Gazer Shark" once per turn

Scrap Dragon X EARTH Level 8 [ Dragon / SynchroEffect ] ATK 2800 DEF 2000 1 Tuner + 1+ non-Tuner monsters Once per turn: You can target 1 card you control and 1 card your opponent controls