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And that's with having played Magic since 1994, and worked in a comic & game shop (i.e., rying everything on the market) in th late 199os TCG boom years

Around 13 to 20 Trainer cards is a good start

Card Images Product Information Magic: The Gathering The Lost Caverns of Ixalan Collector Booster 6 Box Case Product Summary: - The Collector Booster gives players immediate access to the coolest, most desirable cards from The Lost Caverns of Ixalan

Ultra/Ultimate/(Holographic?) Rare LTGY-JP045 Gauntlet Shooter EARTH/Warrior - Xyz - Effect/Rank 6/2400/2800 2 x Level 6 Monster During your Main Phase, you can activate this effect by removing 1 Xyz Material from this card and selecting 1 Monster your opponent controls