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In essence, you can Mindslaver your opponents spells and use them to your advantage

Related Hakbal pays off your Merfolk typal strategy but granting every Merfolk Explore at the beginning of combat

ElectrodominanceElectrodominance only feels worth it if you have another card worth casting in hand, and you have the mana to cast said spell

The Overlord of the Mistmoors might be the only one that has some benefit from not entering the battlefield as a creature amongst the Overlords, as it makes it immune from creature board wipes while it is still Impending

Typically, this zone has been somewhat of a wasted resource in Sliver decks, so Sliver Gravemother certainly fills that niche