what does psa mean in pokemon cards PSA | Grading Standards

Enact Doom's world domination with an army of villainous Doombots at your command and strategies to weaken your opponents while strengthening yourself

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(Source) His rationale behind making the change is that it would allow people to try out cards they wouldnt normally for a defined period of time in order to determine whether or not they wanted to house rule them to be legal within their own playgroups for a longer period of time

You can attack on your turn, then use this to ambush the opponents during combat with a surprise 3/4 flier and a newly untapped creature that you blink