Flawless Maneuver isn't quite Heroic Intervention, but it does allow you to make all of your creatures indestructible for one turn , and it's free to cast as long as you control Kaalia
This four mana 1/5 doesn't hit hard (yet) but gives opponents a card whenever you cast a spell
Blue also tends to have some very good card-draw spells at instant speed, which are great to use when youve left mana open during your opponents turn
If that's not enough, Shadowspear also has an activated ability to strip Hexproof and Indestructible from all your opponent's permanents
We also have an entire ranking dedicated to card draw payoffs if you're interested in more depth on the subject
We ended up 4-1 in our matches and played almost exclusively tier decks along the way, beating GB Midrange twice, Dredge, and UW Control while only losing a close three-game match to Tron