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But which anti-spell cards are the best

Each of the decks will contain new and reprinted cards

Now to explain that part

Once per turn, during either player's turn, when a Spell/Trap is activated: You can negate the activation of that Spell/Trap Card, and destroy it

If Mogis is an enchantment it would be harder to remove than a creature, so finding more enchantments that deal damage to everyone at the table would be key

As long as Ultimate Tyranno is able to attack, it also means that no other monsters on the Field can, so the player's Field should be properly set up for it beforehand so they don't miss out on inflicting damage to their opponent's Life Points.