You can collect the first 18 cards and a few promo cards, thanks to various case files
You can add in more madness and discard effects to turn up the early pressure even more, or add white recursion particularly Abiding Grace and play the value game with Squirrel Sanctuary and Legion Vanguard, finishing with chip from Vermin Gorger and Sanctuary Raptor or an overwhelming army of tokens pumped by Drey Keeper
Why the count stretches so wide: Unique cards: Roughly 27,000 distinct designs, growing with every annual release
Feature Explanation Circular Nintendo seal169167 48.5 KB UK Print license seal Oval Nintendo seal320259 29.8 KB NA Print license seal First Print Topps Logo (Blue)409273 35.8 KB First Print Topps Logo (Blue) Second Print Topps Logo (Black)314205 28.9 KB Second Print Topps Logo (Black) Third Print Topps Logo (Blue)321208 27.1 KB Third Print Topps Logo (Green) Fourth Print Topps Logo (Red)313200 26.6 KB Fourth Print Topps Logo (Red) Note: that the last nine non-holo TV cards (the puzzle cards) have no Topps logo present so print can only be distingushed by holo type
Many artifacts serve as mana accelerators or provide powerful abilities that any color deck can access
While Garth may not have cast all these spells in Arena, I feel confident that he could have, had he needed to (or if his library had been shuffled differently?)