Whenever Life of the Party attacks, it gets +X/+0 until end of turn, where X is the number of creatures you control
In addition to that, people probably just really like the artwork, seeing two halves come together into such a meaningful and collectible heart-shaped pose
Similar to this years Lost Art Promotion (see A New Lost Art Promotion for Yu-Gi-Oh!), the 2020 Lost Art Promotion will offer a different card each month in January, February, March, June, July, and August
Black Gravecrawler 7.6 Bloodsoaked Champion 7.4 Dread Wanderer 7.3 Gutterbones 7.2 All recurring 2/1s for B
Up to four copies of a unique Pokmon card can be in your collection in total (so if you already have three, only one will be transferred), and just one copy of each ACE SPEC, Prism Star, Pokmon Star or part of a V-UNION card
4 Golem Skyridge $460.46 Do Golems Have Tails