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Mox Diamond doesn't give you more mana, just faster and more colorful mana, so it has to take a slot that would have gone to a spell rather than one that would have been a land

If only we had more options to deal with indestructible creatures for 2 mana in blue

Since youre already entombing cards, you can take the next step with Reanimate or Living Death

Some removal effects and suppression effects only work on Special Summoned monsters, so it's an advantage not to receive them

Separately, these specific abilities arent exactly top-tier, but Formidable Speaker is one of those cases where it is greater than the sum of its parts