Number: CH01-EN001 Rarity: Ultra Rare Attribute: DARK Monster Type: Dragon Card Type: Effect Monster Attack: 1800 Defense: 0 Description: If this card is Normal or Special Summoned (except during the Damage Step): You can discard 1 card
The rulings for these cards being legal depends on the format you're playing in
A 1-mana red creature that only needs to tap to activate, Goblin Welder is the quickest way to turn that 0-mana Phyrexian Walker into a Darksteel Forge in a flash
You can even Duel in a Starter-Deck-only event at a Yu-Gi-Oh
During your Main Phase, you can Normal Summon 1 monster that mentions "Clear World", in addition to your Normal Summon/Set
Sauron, the Dark Lord is grossly powerful, but I figure having it in the 99 makes it much fairer, and it serves as a lightning rod for removal before my commander hits the battlefield