You don't have to reveal a drawn card with miracle if you don't wish to cast it at that time.
Entreat the Angels
If the card with miracle leaves your hand before the triggered ability resolves, you won't be able to cast it using its miracle ability.
You still draw the card, whether you use the miracle ability or not. Any ability that triggers whenever you draw a card, for example, will trigger. If you don't cast the card using its miracle ability, it will remain in your hand.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Todd Lockwood
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
