how does the extra deck work in yugioh A list of every Monster (separated by card type) that can be Summoned under locks from the “R.B.” cards [Machine monsters with 1500 or less ATK] (click on image Extra Deck | Yu-Gi-Oh! Wiki

Drag to the Roots can see play in many formats where youre interested in 1-for-1 removal

Enduring Curiosity is a perfect fit: It has flash, so it can grow as Sonic attacks, and you can play it after attackers get through before combat damage for a surprise advantage or at the end of your opponent's turn if you have extra mana

Though which ones do you want to immediately start hunting for

Red-Eyes Darkness Metal Dragon X DARK Level 10 [ Dragon / Effect ] ATK 2800 DEF 2400 You can Special Summon this card (from your hand) by banishing 1 face-up Dragon monster you control

In particular, many Magic: The Gathering dragons have abilities that pay off when other dragons enter the battlefield or attack