All things considered, I think you can argue that Invasion of Ravnica is anywhere in the A- or B-tier range, although I'm going to aim high and put it in A-tier
Wurmcoil Engine Having existed since 2010, Wurmcoil Engine is hardly a new card
Tutors: Transmute Artifact, Gamble, Mystical Tutor, Personal Tutor Ramp: Mana Crypt, Solemn Simulacrum, Thran Dynamo, Gilded Lotus, Mana Vault, Grim Monolith, Basalt Monolith, Voltaic Key, Coalition Relic Disruption: Force of Will, Mana Drain, Counterflux, Vandalblast, Blasphemous Act, Pongify, Rapid Hybridization, Cyclonic Rift Draw: Rhystic Study, Recurring Insight, Consecrated Sphinx Utility: Lightning Greaves, Ral Zarek, Time Stretch, Dack Fayden, Sensei's Divining Top Lands: Academy Ruins, Strip Mine, [Reliquary Tower]], Command Tower, Sulfur Falls, Steam Vents, Shivan Reef, Desolate Lighthouse, Cascade Bluffs, Scalding Tarn, Volcanic Island, Minamo, School at Water's Edge, Ancient Tomb, Myriad Landscape If you're mad enough to fully bling out a Coin Flip deck, then here's a list for you to ponder: Next One's A Secret
We did an extensive review of the gameplay and mechanics of the two latest starter decks
