Field Magic cards generally weren't thought of as
very good, as they have to sit on the Field, and
most aren't even worth destroying, because (at least
in the beginning) the general attack boost for a
type or attribute wasn't enough to tip things in
your favor. But there are a few that are
playable, most notably things like A Legendary
Ocean, Skyscraper 2-Hero City, and Ancient
City-Rainbow Ruins. The group of useful and
playable Field Magic cards goes up by one with U.A.
The first effect, at least in principle, does slow
U.A. Monsters down. You have to Normal Summon
a U.A. (and you know that by now they gain their
speed through Special Summon) but in using a Normal
Summon you can add any U.A. you choose from the Deck
to your Hand. That, alone, might not be enough
to warrant being played in the Deck. But the
second effect does.
As for that second effect, if a U.A. is Special
Summoned to your side of the Field, ALL Monsters
(not just your U.A. ones) gain 500 attack. The
fact it encompasses any Monster you're playing makes
that a whole lot more worthwhile, as does the fact
most of the U.A. have moderate to low attack, so the
boost is greatly appreciated.
Now, the concern I have, and I did some digging but
I couldn't find a ruling on this...the card reads
(or at least I take to read) that EACH turn you
Special Summon a U.A. your Monsters will gain 500
attack. It says once per turn, nothing about
only once, but I did read that even if U.A. Stadium
leaves the Field, all your Monsters that gained an
attack boost from this card, the boost doesn't go
away when Stadium leaves the Field.
Regardless, this can make a quick Deck even quicker,
and I'm very in favor of this.
4/5 You want this about as soon as you can get it
in the game, and it does become less powerful mid to
late game. But very good for a Field Magic