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Another thing that jumped out at me is that a lot of slivers have abilities that cost mana, and if we get too many in play it can start to become a burden

Palossand ex From Supercharged Breaker [C][C][C] Sand Tomb: 160 damage

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Furthermore, Domain can be activated during your opponent's main phase, but this can only be activated during the opponent's main phase, and the GY effect is also the same as Dinomorphia Normal Trap, so it is basically inferior to Domain in terms of usability