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It doesn't have to attack, and you can target yourself, so it's a very flexible card

Jumpstart: Historic Horizons Information (Note: The Card Image Gallery and Packet Lists will be updated throughout Jumpstart: Historic Horizons previews and will be complete on August 4.) Release Date : August 26 exclusively on MTG Arena Release Events : August 26October 14 Previews : July 26August 3 Hashtag : #MTGJumpstart Full Card Image Gallery and Packet Lists : August 4 Legality : Jumpstart: Historic Horizons will be legal in Historic upon release on August 12

I see this having a potential home in decks with high creature counts, those that are more midrange but mostly those with any sort of synergy with sacrifice outlets

One of the Cosmoem you linked would fall into this category, but note that it's not a good example because 1) it's an evolved Pokemon, meaning it takes resources to establish, and 2) it's got a substantial retreat cost

This could be a Commander style of play

Just like Umbreon ex, Sylveon ex is blessed with a quirky, competitive moveset