Duke Devlin appears at the gate at stage 13 (DM) Unlock Missions : Reach Stage 13 in Duel World (DM) to trigger his unlock missions Achieve 1 Comeback Victory(ies) in Duels against Duke Devlin at level 30 using Yami Yugi

Ballista Wielder Bane of Hanweir Baneclaw Marauder Blossom-Clad Werewolf Branded Howler Conduit of Emrakul Conduit of Storms Dire-Strain Anarchist Dire-Strain Brawler Dire-Strain Demolisher Dronepack Kindred Erupting Dreadwolf Fangblade Eviscerator Fearsome Werewolf Fibrous Entangler Flameheart Werewolf Frenzied Trapbreaker Galian Beast Gatstaf Howler Gatstaf Ravagers Graveyard Glutton Greater Werewolf Harvesttide Assailant Hinterland Scourge Hollowhenge Huntmaster Howling Chorus Howlpack Alpha Howlpack Avenger Howlpack of Estwald Infested Werewolf Ironfang Kessig Prowler Krallenhorde Howler Krallenhorde Killer Krallenhorde Wantons Lambholt Butcher Lambholt Ravager Lesser Werewolf Lone Wolf of the Natterknolls Lord of the Ulvenwald Merciless Predator Monster Mashup Moonlit Ambusher Moonrage Brute Moonrise Intruder Moonscarred Werewolf Neck Breaker Nightfall Predator One of the Pack Rampaging Werewolf Ravager of the Fells Riphook Raider Savage Packmate Seafaring Werewolf Shrill Howler Silverpelt Werewolf Sinuous Predator Smoldering Werewolf Spellrune Howler Stalking Predator Storm-Charged Slasher Tangleclaw Werewolf Tavern Smasher Terror of Kruin Pass Timber Shredder Tovolar's Magehunter Tovolar's Packleader Tovolar, the Midnight Scourge Treacherous Werewolf Ulrich, Uncontested Alpha Ulvenwald Abomination Ulvenwald Captive

Sure, she can double up your damage, but if that's your plan, there are a ton of options available
For one red mana you give something +3/+0 until the end of the turn, which is already great, and then if it dies that turn you get to replace it with a 2/2 face-down card instead
Understanding MTG Alchemy Format Courtesy of: For all you planeswalking peeps who've been living under a rock, listen up
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