Especially in aggro, having too many legendary cards can lead to unplayable hands, and if that happens, you'll be easily caught up to and fail, so there is a point to having duplicates
Land Color tag templates(None) Bloodstained Mire , Pay 1 life, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle
If heads, during your opponent's next turn, prevent all damage and effects from attacks done to this Pokemon
In this deck, the goal would be to get it out, make it unblockable with Plankton, and buff it up with SpongeBob before kicking your opponents in their Bikini Bottoms
This deck, with its off-color green game plan, will never do that
But oh well The altaria in particular is one that catches the eye easily