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Both also have a nuke effect

When properly Synchro Summoned, Trishula can banish one card from the opponent's field, one from their Graveyard, and one randomly from their hand

What made them especially good at the time was their status as Pendulum monsters, allowing them to take advantage of traps to negate or banish the opponents monsters, only to come back through Pendulum summoning the following turn

Unlike Magic, where decks are built around different types of land needed to call them into play, any card in Unlimited could feasibly be put into any deck, although potentially at a cost of extra resources

Big splashy alternate wincons are definitely good for Commander