mtg sefris commander deck Custom Guide (Enter the first room or advance to the next room.) Create Undead — Whenever you complete a dungeon Sefris of the Hidden Ways

That should be obvious, but it means youre buying a deck full of hyper-specific cards that dont translate well outside of their intended precon or strategy

Effects like the Historic banned Spreading Seas can fix this and, since Islandwalk is a recurring mechanic across Merfolks, it is probably worthwhile running some effects like that, making Master of the Pearl Trident an absolute menace

Whenever this Dimir commander attacks, you clash (which is a mechanic that cares about high mana value), and if you win you get to cast an expensive card for free

Prioritize haste and evasion so Balefire Dragon connects at least once and resets the board in your favor