User blog comment:BlitzerRyuusei/Game Flow As It Relates to Deck Construction/@comment-137.132.3.8-20150302030249/@comment-137.132.250.12-20150303031538

You underestimate the one turn of walling. That one turn alone gives you the hand to drop for Ulith Lv3's effect.

Of course it is not necessary. But it was only one of two ideal scenarios. Either you wall, or you use Enigma Aura's effect to heal, then regen your field through Miria. Texahammer and Enigma's LBs are certainly nothing amazing, but their effects warrant playing them.

The idea with Ulith is that you want your opponent to come down stuff that are as small as possible. The smaller the better. That way, you have an even easier time of banishing them. At Lv3, you are not maintaining your now pointless field, but using that advantage in field to not have to replace it.

The point is if you have a full field at the start of your Lv3, you can drop your hand, shoot one card for 7k (likely leading to a banish). Then you can come down Cerebus or something else to open another hole. If your opponent wants to come down small stuff, sure, he is punished. If he wants to wall as well, your 6k, 6k, 9k field just became a 8k, 5k, 8k field with at least one open hole, which can definitely take down most Lv2/3 fields.