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Leads to a ton of consistency issues in an already somewhat inconsistent deck

Do they create good moments

If that's not enough power for you, it's part of many infinite combos, typically utilizing Pitiless Plunderer

As an example, heres a Power 9 Series winning list of Brian DeMars, using every one of those cards alongside his playset of Thoughtseize: Creatures (2) Lands (16) Spells (42) 1 Sensei's Divining Top 1 Tendrils of Agony 4 Brainstorm 1 Fastbond 2 Mana Drain 1 Vampiric Tutor 1 Mystical Tutor 1 Yawgmoth's Will 1 Duress 4 Force of Will 1 Demonic Tutor 1 Time Walk 1 Ancestral Recall 4 Gush 1 Mind's Desire 4 Merchant Scroll 1 High Tide 1 Chain of Vapor 1 Black Lotus 1 Lotus Petal 1 Mox Emerald 1 Mox Jet 1 Mox Ruby 1 Mox Sapphire 1 Empty the Warrens 4 Thoughtseize Theres even a Fastbond plus an Ancient Grudge in the sideboard, so it doesnt really count as a Grixis deck!