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For example, if youre using a commander like Gishath that cares about a single creature type, include cards like Icon of Ancestry that let you choose a creature type to apply an effect to, as well as cards that care about your specific creature type (like Thunderherd Migration in the case of Gishath)
Make sure you pack in some sacrifice outlets for quick access to your cached cards and to prevent your opponents from exiling Toluz, making the stored cards moot
There have been plenty of discussions in the past about the dangers of a banned-as-companion list: it's one more list you have to track and adds complexity, among other reasons
Overload [cost] means "You may choose to pay [cost] rather than pay this spell's mana cost" and "If you chose to pay this spell's overload cost, change its text by replacing all instances of the word 'target' with the word 'each.'" If you don't pay the overload cost of a spell with overload, that spell will have a single target