Warden requires two mana to hit his second level, which means that in order to activate him on curve youre taking a lot of damage from lands and postponing dropping a tapped land until later turns
Hydro-Channeler Ichor Synthesizer Ikra Shidiqi, the Usurper Illusion Spinners Imagecrafter Imbraham, Dean of Theory Imoen, Mystic Trickster Imperious Mindbreaker Inalla, Archmage Ritualist Inalla, Archmage Ritualist Incursion Specialist Indigo Faerie Information Dealer Informed Inkwright Inga Rune-Eyes Ingenious Prodigy Ink Dissolver Inkfathom Witch Inspired Skypainter Inspired Sprite Irencrag Pyromancer Isareth the Awakener Ith, High Arcanist Ivy Seer Ixidor, Reality Sculptor Izzet Chemister Izzet Chronarch Izzet Guildmage Izzet Staticaster Jace's Archivist Jace's Projection Jace, Vryn's Prodigy Jadar, Ghoulcaller of Nephalia Jadzi, Oracle of Arcavios Jadzi, Steward of Fate Jalira, Master Polymorphist Jasmine Seer Jeleva, Nephalia's Scourge Jhoira of the Ghitu Jodah, Archmage Eternal Jodah, the Unifier Jodah, the Unifier Johan Johann, Apprentice Sorcerer Joined Researchers Jon Irenicus, Shattered One Joraga Visionary Jori En, Ruin Diver Joshua, Phoenix's Dominant Jubilant Skybonder Judge of Currents Jushi Apprentice Kadena's Silencer Kadena, Slinking Sorcerer Kaho, Minamo Historian Kangee, Aerie Keeper Kangee, Sky Warden Karfell Harbinger Kaseto, Orochi Archmage Kaza, Roil Chaser Keen Duelist Keeper of the Beasts Keeper of the Cadence Keeper of the Dead Keeper of the Flame Keeper of the Light Keeper of the Mind Keeper of the Nine Gales Kefka, Court Mage Kefka, Dancing Mad Kefka, Ruler of Ruin Kess, Dissident Mage
If you are curious on all the new cards the set has to offer, check out this link
Red does have an actual blink effect in Worldgorger DragonWorldgorger Dragon
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I also just like this in any Dragon deck that includes Green given the two mana off you'll get since Dragons are the most popular tribe in Commander
