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Why Are They All Subtype Siege

A focused commander makes every card slot more efficient and reduces dead draws

We see 5 mana spells that reanimate a thing a lot, and in your typical format, they arent that great

It creates giant logistical nightmares for tournament organizers and was kept out of the Vintage format

Also, a lot of buylists require you to sort your cards into an exact order (either by set or alphabetically), so "sorting" is a lot more effort than just pulling out high-value cards

Crimson Dragon Crimson Dragon Dragon SynchroEffect If this card is Special Summoned: You can add 1 Spell/Trap that mentions "Crimson Dragon" from your Deck to your hand