For starters, you know based on the whole deck vs
If a Dragon you control enters the battlefield attacking, it won't cause The Ur-Dragon's last ability to trigger
Shroud is a protection that is a double-edge sword, but because this card gives it to all creature until you upkeep, youre using that other edge against your opponents
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Thank you for reading, and keep improving your mana bases
Your other artifact dorks get +1/+1, so it's a nice Glorius Anthem for artifact creatures in the Command Zone