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Honorable Mention #2 - (#12 Overall) - Greven, Predator Captain $0.75 for this Rakdos five-drop that's in a strong 1,636 decks for you folks (According to EDHREC.com)

Did you cast something for free

Abandon the Post Ancient Grudge Backdraft Hellkite Bash to Bits Blast from the Past Bulk Up Burning Oil Calibrated Blast Call the Mountain Chocobo Conflagrate Desperate Ravings Devil's Play Duel Tactics Earth Rift Electric Revelation Electroduplicate Engulfing Flames Faithless Looting Fire Nation Attacks Firebolt Firecat Blitz Fires of Undeath Flaming Gambit Flaring Pain Flash of Defiance Flashback Geistflame Ignite the Future Increasing Vengeance Isengard Unleashed Kaleidoscorch Kindle the Inner Flame Laughing Mad Lava Dart Light Up the Night Lightning Surge Lost in Memories Nibelheim Aflame Nightbird's Clutches Past in Flames Prisoner's Dilemma Random Encounter Reckless Charge Recoup Return the Past Rolling Temblor Scorching Missile Seize the Day Seize the Storm Shattered Perception Snort Solstice Revelations Sorceress's Schemes Strike It Rich Tome Blast Visions of Ruin Volcanic Spray Volley of Boulders Will of the Jeskai

It takes some time for toxic gas to dissipate

It can save a utility creature from basically all removal (even board wipes), and also enables two-card combos with targets like Devoted Druid