A graded card (Pokmon, for example) is a collectible contained in a clear case (sealed by ultrasound) with a label identifying all its characteristics and attesting to its condition, usually on a scale from 1 to 10
Red also has a ton of other effects that will let you do this, such as Jeska's Will and March of Reckless Joy
The easiest way to think about Adventure cards is by thinking of them as just a creature spell with an instant or sorcery stitched to it
(And if youre an idiot like me, who doesnt read the piece of paper with READ THIS FIRST before thinking you know better and shuffling the cards, theyre also numbered so you can put them back in the correct order.) Once youve played that through once, you can go ahead and shuffle as much as you want, and then play the game proper
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Myr Enforcer, Myr Galvanizer, Myr Propagator, Myr Retriever and Myr Welder are all in the list, along with the eminently playable Myr Battlesphere