I especially like that you have so much control over the text box and I think it just looks more like a Magic card than Cardsmith creations
The Nyx basics are simple yet gorgeous, especially in foil
Lightning Bolt is an all-time classic, so no real introductions are needed there
In all honesty, as one of my all-time favorite cards, Haakon, Stromgald Scourge is currently once again in my cube list for testing, even though it's incredibly doubtful he'll stay in for long this time around
2 Add: Rogue's Passage This Land Ensures Your Combat Damage Connects The land I recommend using in the Limit Break precon deck is Rogues Passage
Additionally, at the start of your upkeep, if you control 20 or more Artifacts, you win the game