A commander that has no relevant abilities or is just not very fun
However, neither of these decks has an issue with energy acceleration, as Charizard ex has an ability for that purpose and Ceruledge ex only needs one energy to attack
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If Sorin, Lord of Innistrad is still on the battlefield when that ability resolves, it will then destroy Sorin and return him to the battlefield under your control
Hopefully that breakdown of why Stock Up is relevant and just how much it helps decks across every format provides some insight into just why everyones talking about it (and why a Standard-legal Uncommon is more than $15 CDN!)
Any repeatable proliferate effect synergizes well with everything from planeswalkers to poison counters and beyond
