Szat is the star here, offering tons of sacrifice fodder and card draw as a sacrifice outlet
Meanwhile, Archmage of Runes not only draws cards the same way, but it also makes your spells cheaper, turning every cantrip into a little engine
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In game, Blade of the Swarms will let you either Put +1/+1 counters on this creature. or Put target exiled card with warp on the bottom of its owners library. Both options could be good in a pinch
They usually look much closer to a normal Magic card, but with strange details, like the wrong back, alternate frames, or even crystals glued on for testing special effects