A useful combat trick. On the attack, you can
play it before blockers and let your creature
fly over for a quick hit, without leaving you
sans blockers. And on the defense, it can snag
an opposing flyer out of the air by blocking it
with your comparatively larger ground-pounder.
I'd say it's good in any blue deck that seeks to
win through combat, but doesn't have many
flyers.
Vault Skyward seems to have been designed for
limited games, which is where it really gets a
chance to shine by letting you ambush flying
creatures. In 60-card decks, there are options
that usually do more for the deck, but there
might be some niche application for this card.
You might put it on an Isochron Scepter and keep
untapping a Prodigal Sorcerer or something - it
wouldn't be "tier one," but it would be pretty
funny.
Today's card of the day is Vault Skyward which
is costs a single Blue mana to untap a target
creature and give it Flying until end of turn.
This seems to be a bit overlooked as it has
several applications for turning a grounded
creature into a potentially unblocked threat,
getting a second use from a creature with a tap
ability, or defensively by using a previous
attacker as a blocker. The versatility of
the effect for a single mana is nice when
compared to Jump, but most would prefer the card
draw from Leap. Overall a decent, but not
incredibly powerful card that can support the
right the creatures if the deck is built with it
in mind.
For Limited this is a solid and surprising play
that can make Infect creatures in a Blue/Green
or Blue/Black deck a much bigger threat to the
opponent or offer an option for defending
against a Flying threat. Even if it is
just used to turn your big creature into a
blocker it functions as a sort of indirect
removal. A fun card that is worth playing
in Sealed if it fits into your colors and a
draft choice alongside other support cards like
Proliferate effects.