I have good news for you new players, and it applies to the established players, too: once you have a decent-sized collection, the world of MTG opens up to you exponentially
You can tap any two untapped artifacts and/or creatures you control, including Adaptive Gemguard itself and other creatures you haven't controlled continuously since the beginning of your most recent turn, to pay the cost of Adaptive Gemguard's activated ability
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This makes it worthwhile to keep bringing back the Dark Magician
Durable Semi Rigid Construction: Provides firm edge support and flexibility for easy card insertion and removal without bending
If you cast a creature spell this way, it gains haste until you lose control of that creature (or, in rare cases, you lose control of the creature spell while its on the stack)