There's a plethora of exile removal in Standard right now, meaning that an animated Nutrient Block isn't unbeatable, but even if they deal with the Block, Zoetic Glyph at least lets you Discover 3--potentially turning up another Zoetic Glyph or casting our number one pick for most exciting colorless card in Edge of Eternities : Tezzeret, Cruel Captain
Those are good, but they arent as special
Zygon Infiltrator Zygon Infiltrator is a sneaky shapeshifter that lets you tap down another creature and put a stun counter on it so it stays tapped longer
Mana Rocks Mana rocks arent just Sol Ring plus Signets. This guide shows how to evaluate rocks by floor, ceiling, and average, then match them to your curve, colors, commander, and bracket
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You can get a cheap one for around $2.50, but most reprints are in the $3 range