mtg as an additional cost discard a card Mind Extraction Price & Details — Apocalypse Draw three cards. MTG Cube: Top 14 Discard

Including cards that are only for one archetype is fine, but you don't want to include too many of them

Generally, Secret Lair Commander precons come with about 10 new-art reprints, so we can expect that as a floor for the Miku deck

The one thing I feel is missing in the set are reliable big X spells to close out the game, to capitalize on the sacrifice a token to make mana aspect of Kykar, but that doesnt outweigh the benefits I see in being able to create tokens and mana straight from the command zone

Arcum's Whistle, Arcum's Sleigh and Arcum's Weathervane are all creations of Arcum Dagsson, a powerful mage that researches the artifacts left after the Brothers' War