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Besides having Flash (which means it can be played whenever you use an Instant), you get to choose one of three effects when the snake enters

The Presence is a four-drop 3/3 with a Swamp landfall ability that can draw you a card and lose a life or Shock something for two and then gain two life, so it's removal of smaller things or planeswalkers with lower loyalty or just aimed at opponents for 2 life gained on damage done

A member of the former Commander rules committee dubbed them legal, but only for the person whose name is on the card - meaning that, as soon as they're sold, they go from functional playing pieces to pure collector's items

It is not needed at all, but I figured I would have had to buy penny sleeves and a box and other shipping equipment, so I went the easy route