Legality depends on the tournament format -- Wingshield Agent can be legal in some formats and banned or restricted in others
For this reason, it may end up being better to wait to cast Urabrask until a future turn when you can make immediate use of its ability to produce mana by casting instant spells in response to opposing removal
But wouldn't we all like him in our decks
Certainly Wizards reacted more strongly to this crisis than we usually see, and part of that was taking the new and volatile energy mechanic off the table for a little while
Ten years to powercreep Grave Titan is ostensibly okay, in my book and it seems Wizards agrees, dropping this thing into a Standard format that was decidedly far less about six mana plays like Huntmaster
The Sneak Attack deck is led by Anowon, the Ruin Thief, a legendary creature that rewards you for stealing cards from your opponents' libraries