You may target any artifact, creature, or land, not just a tapped one. If the targeted permanent is already untapped as Infuse resolves, Infuse won’t affect it, but you’ll still draw a card at the beginning of the next turn’s upkeep.

Infuse : règles, fonctionnement et interactions (MTG)

Infuse is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Untap target artifact, creature, or land. Draw a card at the beginning of the next turn's upkeep.

How it works : Infuse

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2009· Wizards of the Coast
You may target any artifact, creature, or land, not just a tapped one. If the targeted permanent is already untapped as Infuse resolves, Infuse won’t affect it, but you’ll still draw a card at the beginning of the next turn’s upkeep.
No other card is named in this ruling.