Use Willbreaker to take all your opponent's creatures, and beat them to death with their own creatures while protecting your Willbreaker.
Coat with Venom
: This is a very versatile card. It can either: Target a wall, to kill an attacking creature; just take a creature; block an opponent's creature with their own creature; or stop a creature that is attacking from dealing damage.
Dark Petition: Find willbreaker, or if that is done, find Descent of the Dragons.
Center Soul
: protect my Willbreaker.
Refocus
: Not normally a great card, but it's a cantrip, gives me an extra blocker if need be, whether I'm targeting my creatures or theirs.
Twin Bolt
: What's one damage on a creature, if that piece of damage lets you take control of the creature. This card is essentially a 2 for 1, and/or early-game removal.
Evolving Wilds: It's in here because I would have used Mystic Monasterys but it fills the graveyard for my Dig Through Times.
Jeskai Barricade: Helps me to survive the early game, before I have Willbreaker out, and can protect Willbreaker if it would be removed.
Day's Undoing: It's like Dig Through Time, but much better. By turn 3/4, I can play out lands, and maybe some walls, then reset my hand.