Urza, Lord High Artificer [Best Commander for Artifact-Based Decks] Every artifact you control taps for blue mana the moment Urza enters
If Esper is the secret police, Jund is the cap-wearing Brooklyn fellows with crowbars
It reprinted iconic cards, but with a gold-bordered back that made them illegal in tournaments

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And I did say over 200 cards, not exactly 200 cards
In your upkeep, you get one free impulse effect but cannot wait until a future turn to cast it, but you didn't spend any mana so you should have everything mana wise to cast it