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In Boros Energy, specifically, it fits perfectly into a game plan that wants to apply pressure quickly, build out the battlefield, and punish opponents for stumbling even a little
In terms of mailing came in well secured and wrapped
Many serious UK collectors do both: they use ACE for personal collection pieces where the slab aesthetics matter, and PSA for investment-grade cards where global liquidity is the priority
So if enough -1/-1 counters are placed on a modular creature to kill it outright, say if your 1/1 Arcbound Ravager gets hit with a Black Sun's Zenith where X=2, then the creature will die
They are typically made of thin plastic material and are relatively inexpensive