The Ur-Dragon

Legendary Creature — Dragon Avatar    (CMC:9)

Eminence — As long as The Ur-Dragon is in the command zone or on the battlefield, other Dragon spells you cast cost less to cast. Flying Whenever one or more Dragons you control attack, draw that many cards, then you may put a permanent card from your hand onto the battlefield.

048 C17 ★ ENJaime Jones

™ & © 1993— Wizards of the Coast

Notes: TODO: Update Copyright

Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

The Ur-Dragon {4}{W}{U}{B}{R}{G} Legendary Creature — Dragon Avatar Eminence — As long as The Ur-Dragon is in the command zone or on the battlefield, other Dragon spells you cast cost {1} less to cast. Flying Whenever one or more Dragons you control attack, draw that many cards, then you may put a permanent card from your hand onto the battlefield. 10/10

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View this MTG card on Gatherer

8/25/2017
You draw one card for each Dragon you controlled that attacked, even if some of them left the battlefield before The Ur-Dragon’s triggered ability resolves.
8/25/2017
You may only put one permanent card from your hand onto the battlefield, no matter how many Dragons you attacked with or how many players they attacked.
8/25/2017
If a Dragon you control enters the battlefield attacking, it won’t cause The Ur-Dragon’s last ability to trigger.
8/25/2017
The Ur-Dragon’s triggered ability resolves after all attackers have been chosen. You can’t attack with some Dragons, put a creature card with haste onto the battlefield, and then attack with that creature. Similarly, any “whenever a creature attacks” abilities of the permanent card you put onto the battlefield won’t trigger.
8/25/2017
Three eminence abilities are triggered abilities. That creature must be on the battlefield or in the command zone as the trigger event occurs and also as the triggered ability resolves. If the creature is in an appropriate zone as the trigger event occurs but leaves that zone, the ability won’t do anything as it resolves.
8/25/2017
Notably, if your commander is on the battlefield and its eminence ability triggers, but it’s put into the command zone before that ability resolves, that ability won’t do anything as it resolves. This is because an object that changes zones is considered a new object.

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