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Any creature you control that couldn't be targeted by the original spell (due to shroud, protection abilities, targeting restrictions, or any other reason) is just ignored by Zada's ability
Flavor Trying to create the optimal working deck is one thing, but there is also a different kind of quality to consider
The most popular cards are ones that work well with the history of Magic cards like Multiversal Passage, Spider-Ham, Peter Porker, and Spider-Punk
Now, its not sweeping X or less, which is sad, but it can always sweep tokens for zero mana (unless they are copies, in which case they have the copied casting cost.)
If you're in the mood to just be a jerk then there are two options we should explore, but I don't necessarily endorse