They got the nickname shadowless simply because they lack a shadowy background introduced in the next wave of cards, the Unlimited
You have to remember what cards exist and how they interact with the cards you're playing
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Another chaotic way I like to play is with Teferi's Puzzle box because they have to draw their card for the turn during their draw step and then put those cards at the bottom of their library and draw that many more cards taking damage for every card they draw
Lots of mechanics benefit from The Jewel, including Clue tokens, Food tokens, morph, transform, craft, and more
The only thing that keeps Venusaur EX from being a perfect card is a slightly high retreat cost at three Colorless