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Terminus gives you a mass removal response card that will usually be cheap enough to both come in time and be protected against opposing Tempo strategies

Sideboarding in too much removal could lead them to not having enough pressure in the early turns of the game

That seems high

When a creature, it can hide from removal, and while an aura, it can do the same

Lower cost cards can be considered as cards with a cost of 1-3, middle card costs can be considered 4-6, and high cost cards are anything 7 or above

And because you're running a cheap monocolor manabase, you've got the cash spare for those cards, and more fun stuff besides