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The Ur-Dragon

Card Name

The Ur-Dragon

Mana Cost

4

Type

Legendary Creature – Dragon Avatar

Rarity

Mythic Rare

rules Text

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.FlyingWhenever one or more Dragons you control attack, draw that many cards, then you may put a permanent card from your hand onto the battlefield.

Legal Formats

Commander, Legacy, Vintage

Not Legal Formats

Alchemy, Brawl, Explorer, Historic, Modern, Pauper, Pioneer, Standard

Rulings

(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.