Firstly, Tez is card advantage
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As long as it's already on the battlefield when they draw their second card or cast their second spell in a turn, its last ability will trigger
One of its biggest roles is to have cards that, when you open them in a Limited event, will lead you down a path to explore
The biggest problem with this deck is to close the gap between the early game and effectively casting your commander to start bombing the battlefield
Last year, The Pokemon Company issued a statement around barren TCG stock, with promises of "maximizing production," so I can only assume scooping up Excell Brands is part of that mission