We aren't discarding cards early to spend a bunch of life reanimating one big creature before they can deal with it - this isn't Legacy where that will fly
(Note that if you haven't committed to drafting green-blue mill-yourself yet, then by all means take Claustrophobia early
The sacrifice effects should work to keep most bodies off the field, and the rest of the spells are things like Beast Within and Tear Asunder that can hit multiple things
PSA PSA is one of the more well-known card grading services, and they often attend card shows, conventions, and other events
Be it in the form of mana rocks, Stax pieces, or overall powerful effects, removal for these kinds of cards is very important for any deck to be running
This is because a great card in standard can be used across multiple formats, and thus has a cross format value