Unique arts and design style
The card is Mazes End, the prerelease promo card for Dragons Maze set, and it has a key story element if you are into the lore
Naturally, Manamorphose does a ton of work in Combo lists, whether its upping your Storm count or just digging you through your deck for free
Connive allows you to draw a card and discard a card (referred to as looting), and if the discarded card is nonland, then a creature gets a +1/+1 counter
Its perhaps not best-suited to newcomers since it requires keeping tabs on a lot of counters (often different types), but by spending some time planning, you can create Summon creatures and keep them on the board much longer than expected, while also powering up just about everything on your board