If dim shield can be extended +1 turn by this, then Sundial copying is also an option by the way.
It looks like the card was changed to only work on opponent, however, so I'm not really worried about it now.
Right now, sundial copy wouldn't be worth it since it would require a quartet... if cardinal / spirit / material pillars make it into cygnia though (and they seem to be well on their way) then the strategy would be viable via cardinal pillars and light mark. It would give a very nice way to rapidly draw through your deck while the opponent is restrained from attack.
In conjunction with phase shield, this would have been a pretty potent tactic since it would help ensure you could chain your phase shields without leaving gaps.