Alternate frames in Modern Horizons 3 include retro-frame showcase, borderless (concept art, framebreak, and profile), special guest, or extended art
If you cant fit 15 pieces of non-engine you should instead play board breakers as you wont have as high of a chance to see 2 pieces of non-engine
The complex morality, Anyone Can Be Carded and large cast reflects realistically an interdimensional war, unlike many other series which only focus on a relatively small group of characters that aren't justified by being The Chosen Ones
Leader cards can use an effect while outside of the main battle, before later being deployed - flipping the card over to reveal new abilities - by paying their cost to join an arena as a unit card
Popular options include Chandra, Torch of Defiance and Hazoret the Fervent, with Experimental Frenzy being my sleeper pick
The Shadowmoor symbol might suggest a bat wing or dead leaf, but is a Jack-o'-lantern lid taken from the art of the card Reaper King, the King of the scarecrows, a new creature type introduced in the set
