Refocus

The untap clause is the whole reason this exists, and the deck that wanted it knew exactly why. Cantrips that replace themselves are common; one that untaps a creature as a rider opens a narrow but real combo seam. Point it at a creature whose tap ability you want to fire twice, or use it to spring a surprise blocker after attackers have been declared, and the card stops being filler and starts being a piece of a loop. The lineage runs through effects like Twiddle and Vitalize, untap spells that existed for the untap and did nothing for your hand. Stapling a card draw onto the untap is what makes the effect worth a slot: you lose nothing in card economy by keeping the untap available, so the combo line costs you only the mana and a card you were cycling through anyway. It is built to do an unremarkable thing every game and an unfair thing in the one deck constructed to abuse it, which is the most honest reason a two-mana untap-plus-draw gets printed at all.