For the mash/side shuffle, they were completely fine
Neither player can activate effects in response to this effect's activation.
Its the source of some really busted as hell combos, as you can imagine
The last wave of Monarch support provided a spell or trap card for virtually any situation there are traps that provide you with tribute fodder, traps that are unstoppable floodgates, and even a field spell that shuts your opponent out of their entire extra deck
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And, okay, maybe there are certain kinds of cards I happen to see more potential in than others