Decks like Dragapult ex, Ns Zoroark ex, Festival Lead, and Hide n Sneak are optimized to facilitate attacks that cost one or two Energy, so Ancient Bulwark could cause the opponent to miss a turn of attack or discourage them from spending their Energy attachment for the turn on a support Pokmon like Munkidori
Fetchlands and shocklands can also notably damage your life total to grow your Death's Shadow
The icing on the cake is that it gives the rest of your board haste, which means you can pump a sorcery speed token spell, get an instant board, and then use that board to refill your hand
Dark Magician of Destruction From Yu-Gi-Oh
Buster Blader's main gimmick is to draw strength from opposing Dragons
Operational examples are SST editorial frameworks, not value or earnings promises.