(9/25/2006) If either target is illegal at the time the ability resolves (whether because it has left the battlefield, because it has gained Shroud or Protection, or for any other reason), the ability taps the remaining target, but no damage is dealt
Each Set Booster contains 12 Magic cards, 1 Art Card, and 1 token, ad card, Helper card, or special card from Magic's history (a card from "The List")

Release date: 2003-05-26 Ageless Sentinels Astral Steel Aven Farseer Aven Liberator Daru Spiritualist Daru Warchief Dawn Elemental Decree of Justice Dimensional Breach Dragon Scales Dragonstalker Eternal Dragon Exiled Doomsayer Force Bubble Frontline Strategist Gilded Light Guilty Conscience Karona's Zealot Noble Templar Rain of Blades Recuperate Reward the Faithful Silver Knight Trap Digger Wing Shards Wipe Clean Zealous Inquisitor Aphetto Runecaster Brain Freeze Coast Watcher Day of the Dragons Decree of Silence Dispersal Shield Dragon Wings Faces of the Past Frozen Solid Hindering Touch Long-Term Plans Mercurial Kite Metamorphose Mind's Desire Mischievous Quanar Mistform Warchief Parallel Thoughts Pemmin's Aura Raven Guild Initiate Raven Guild Master Riptide Survivor Rush of Knowledge Scornful Egotist Shoreline Ranger Stifle Temporal Fissure Thundercloud Elemental Bladewing's Thrall Cabal Conditioning Cabal Interrogator Call to the Grave Carrion Feeder Chill Haunting Clutch of Undeath Consumptive Goo Death's-Head Buzzard Decree of Pain Dragon Shadow Fatal Mutation Final Punishment Lethal Vapors Lingering Death Nefashu Putrid Raptor Reaping the Graves

Like convoke, improvise itself taps the creature so you can use an artifact to pay for improvise as soon as it hits the battlefield
Commander Damage If a player has been dealt 21 or more combat damage by the same commander over the course of a game, that player loses the game