Onderzeeboot
Ecstatic Orb
I used to have a 360, and didn't mind it myself, but I expanded to 450 to add a little variance. I don't think you need to go much bigger though for variance's sake, but let's see what statistics (link) say! If we rewrite the following formula, whe should be able to calculate the (average) number of cards that are part of both drafts.
Let
N = Number of animals in the population = Your cube's size = 450
K = Number of animals marked on the first visit = Number of cards in first draft = 360
n = Number of animals captured on the second visit = Number of cards in second draft = 360
k = Number of recaptured animals that were marked = Number of cards that were in both drafts
k = Kn/N = 360*360/450 = 288
This equals, on average, 20% (72/360) fresh cards from draft to draft.
Now let
N = Number of animals in the population = 720
k = Kn/N = 360*360/720 = 180
This equals, on average, 50% (180/360) fresh cards from draft to draft.
Now I'ld say 50% is a little wild. That means it's hard to support a theme in your cube unless it consists of a lot of cards. This requires you build in very broad themes, because a lot of the time you will only get part of the cards, which is fatal for mechanics that don't play well with others (extreme examples would be metalcraft and infect). In a smaller cubes you have more control over which cards appear, which allows you to run slightly narrower themes. Since the question was about Goblin Welder, and I consider that archetype relatively narrow, I arrived at the conclusion that your cube might be too big for the theme.
Let
N = Number of animals in the population = Your cube's size = 450
K = Number of animals marked on the first visit = Number of cards in first draft = 360
n = Number of animals captured on the second visit = Number of cards in second draft = 360
k = Number of recaptured animals that were marked = Number of cards that were in both drafts
k = Kn/N = 360*360/450 = 288
This equals, on average, 20% (72/360) fresh cards from draft to draft.
Now let
N = Number of animals in the population = 720
k = Kn/N = 360*360/720 = 180
This equals, on average, 50% (180/360) fresh cards from draft to draft.
Now I'ld say 50% is a little wild. That means it's hard to support a theme in your cube unless it consists of a lot of cards. This requires you build in very broad themes, because a lot of the time you will only get part of the cards, which is fatal for mechanics that don't play well with others (extreme examples would be metalcraft and infect). In a smaller cubes you have more control over which cards appear, which allows you to run slightly narrower themes. Since the question was about Goblin Welder, and I consider that archetype relatively narrow, I arrived at the conclusion that your cube might be too big for the theme.