The minerals (and vespene gas) that you harvest should be spent as quickly and efficiently as possible
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V cards are part of newer sets and often evolve into VMAX or VSTAR cards
Fabricate is a mechanic that gives you the choice of two options, both of which can be excellent in the artifact spaces where these cards tend to be played, but neither of which are super powerful on their own, the way a modal card like Sublime Epiphany is

Here's a full list of every card required for the 'Pulsing Aura Museum 1' Secret Mission: Treecko #156 (Full Art / One Gold Star) Grovyle #157 (Full Art / One Gold Star) Shroomish #158 (Full Art / One Gold Star) Budew #159 (Full Art / One Gold Star) Flapple #160 (Full Art / One Gold Star) Tepig #161 (Full Art / One Gold Star) Quagsire #162 (Full Art / One Gold Star) Zekrom #163 (Full Art / One Gold Star) Morpeko #164 (Full Art / One Gold Star) Meowstic #165 (Full Art / One Gold Star) Oricorio #166 (Full Art / One Gold Star) Brambleghast #167 (Full Art / One Gold Star) Bonsly #168 (Full Art / One Gold Star) Riolu #169 (Full Art / One Gold Star) Meloetta #170 (Full Art / One Gold Star) Carkol #171 (Full Art / One Gold Star) Kubfu #172 (Full Art / One Gold Star) Seviper #173 (Full Art / One Gold Star) Zorua #174 (Full Art / One Gold Star) Malamar #175 (Full Art / One Gold Star) Bisharp #176 (Full Art / One Gold Star) Meltan #177 (Full Art / One Gold Star) Castform #178 (Full Art / One Gold Star) Cinccino #179 (Full Art / One Gold Star) Rewards: 36 Wonder Hourglasses, 12 Pack Hourglasses and 10 Shop Tickets

One of Herald's big advantages here is that its not an artifact and it has substantially more toughness