C Common Supreme Rage X TRAP If you control "Supreme King Z-ARC": Destroy as many monsters you control as possible, except "Supreme King Z-ARC", and if you do, Special Summon up to 4 "Supreme King Dragon" monsters with different names from your hand, Deck, Extra Deck, and/or GY, ignoring their Summoning conditions
For example, removal-heavy decks tend to have a headache against decks that don't care too much for the battlefield (like control decks), or decks that are happy to fill their graveyard (like reanimator decks), or decks that can sacrifice creatures when their enemies point removal at them (like aristocrat Commander decks)
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Starting with an eight-card hand thanks to a companion while your opponent starts with seven is actually pretty similar to the mulligan situation above