Each booster pack contains 12 cards, giving you the volume to build new strategies and stock up on key staples for upgrades and trading
Even still, the ability to swap any artifact token (be it Treasure, Blood, Clue or Map) for a Blightsteel Colossus, Sundering Titan or Inkwell Leviathan on turn two means that the Welder is still a tremendously powerful one-mana Goblin
Goblin Trashmaster Goblin Trashmaster is an expensive Lord, but being able to Shatter at instant speed for no mana cost is an amazing ability in Commander, where powerful Artifacts are everywhere
Basically, no matter what your opponents choose to do, Rhystic Study will be super annoying for them to play around, and whats annoying for your opponents is great for you
Pay life to cast your most impactful black spells ahead of curve things that would cost 5 or 6 mana arrive on turns two and three by spending life instead
For example, if you attacked with one of your three face-down creatures last turn, it should be clear to everyone which one that was