I should point out that card frames have become a lot more complicated since Alpha
(They can't be the targets of spells or abilities your opponents control.) At the beginning of your upkeep, if you control the artifact with the greatest mana value or tied for the greatest mana value, draw a card
In current Standard, you should be aware that most control decks play with one copy of Ugin, the Spirit Dragon and one to three copies of either End Hostilities or Crux of Fate
While Last March of the Ents is a bit simple in its rendering, I bring it up because I love the way mood is expressed in this one
What made it harder to cut is that the ability is a may, and it's a 6/6 flying body
Hellkite Courser is particularly bonkers with The Ur-Dragon since its whenever one or more Dragons you control attack trigger is amazingly powerful, as befitting a nine-mana Dragon Avatar