Blackwing Blizzard the Far North One of the reasons Blackwing took the metagame by storm was their consistent special summoning, allowing them to synchro summon very often
Aside from the far-reaching implications of these modal lands, the new party mechanic (which provides another application for Umara Wizard) promises to add another interesting consideration to deck-building, and landfall is always fun for the weight it adds to every land drop
One of the perks is being able to open an additional pack per day
As such, "Shadow Mist" can search "Mask Change" or "Mask Change II", then be used as the target of that "Change" card to Summon "Dark Law" or "Anki", netting additional advantage through its second effect to search any "HERO" monster from the Deck whenever it is sent to the GY if done during the subsequent turn
All of these are incredibly powerful relative to their cost, with Ancestral Recall forcing a three card draw for one blue mana, Black Lotus and the Moxes being artifacts that generate mana for no cost, Time Walk giving the player a whole extra turn, and Timetwister letting them draw a whole new hand