mtg lost caverns of ixalan collector booster box The Boosters – Mox Boarding House Art Showcase Land in 30% of packs Lost Caverns of Ixalan

P.S.: I wanted to include Songcrafter MageSongcrafter Mage either as winner or runner-up, but it only grants harmonize to another card and doesn't have it itself, so it was not eligible

More about Reality Fracture Mastermind mage Jace Beleren has pushed reality to its breaking point

You want to hit them and double the rest of your damage for the turn, which can come from burn spells or from non first strike creatures that attacked alongside Lightning

You then draw the same number of new cards as you put down from the top of your deck so you go back to seven cards

The Ink Flood, The Hero + The Inklands

From the looks of the box, nothing is crazy new here