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Maxies Hidden Ball trick was primarily used to set up early Archeops NVI to completely prevent your opponent from being able to evolve any Pokmon from their hand

The stack is where spells and effects go before they resolve (meaning happen)

This makes it great for taking down your opponents Bench before they become too powerful

If the Jeskai route makes the most sense, a 1/1 that should immediately gain you life, and be expendable at the same time fits nicely is a battalion setting

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Some Trainer cards are best used later, though, so it can occasionally be better to shuffle them away