When Cloudform enters the battlefield, it becomes an Aura with enchant creature. Manifest the top card of your library (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.) and attach Cloudform to it.
Enchanted creature has flying (This creature can't be blocked except by creatures with flying or reach.) and hexproof (This permanent can't be the target of spells or abilities your opponents control.).
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