As long as your Goblin Welder doesnt have summoning sickness, you can simply tap this pesky little critter, sacrifice your Zuran Orb, Fountain of Youth, or Claws of Gix, and pop that beefy threat into play extremely early in the game, putting you well ahead of your opponent
The way to play Luffy is simple, put two minions each turn if possible and try to overwhelm your opponent
Making them commit more resources to out your 1900 ATK beatstick, then using removal on it makes for a great trade
(Dont worry, you can still use those cards, after revealing them!) For example, reveal a DARK monster and Vanquish Soul Heavy Borger lets you draw a card
This can lead to you setting The Fallen & the Virtuous during your end phase, so it usually demands your opponent's attention unless they want the Duel to quickly spiral out of their control