The Werewolf mechanic isn't keyworded or even named, but it's as much a part of the design as flashback, morbid, or even transform
Deck Filters Loki, Lord of Misrule 5.0%inclusion 5%synergy 15 decks 303 decks Mister Fantastic, Reed Richards 4.0%inclusion 3%synergy 13 decks 326 decks Hawkeye, Trick Shot 3.3%inclusion 3%synergy 9 decks 276 decks Thor, God of Thunder 2.5%inclusion -0%synergy 8 decks 326 decks Multiversal Recruitment 1.7%inclusion 1%synergy 5 decks 303 decks High Synergy Cards The Emperor of Palamecia 53%inclusion 48%synergy 1K decks 1.88K decks Jaya's Immolating Inferno 47%inclusion 42%synergy 877 decks 1.88K decks Crackle with Power 49%inclusion 41%synergy 926 decks 1.88K decks Rewind 46%inclusion 39%synergy 856 decks 1.88K decks Big Score 65%inclusion 39%synergy 1.21K decks 1.88K decks Prompto Argentum 40%inclusion 39%synergy 752 decks 1.88K decks Unexpected Windfall 54%inclusion 38%synergy 1.01K decks 1.88K decks Comet Storm 43%inclusion 38%synergy 808 decks 1.88K decks Mana Geyser 61%inclusion 38%synergy 1.14K decks 1.88K decks Harmonic Prodigy 55%inclusion 37%synergy 1.03K decks 1.88K decks Top Cards Veyran, Voice of Duality 50%inclusion 29%synergy 936 decks 1.88K decks Storm-Kiln Artist 49%inclusion 9%synergy 924 decks 1.88K decks Counterspell 49%inclusion -3%synergy 915 decks 1.88K decks Aetherize 46%inclusion 34%synergy 856 decks 1.88K decks Sorcerer Class 40%inclusion 32%synergy 746 decks 1.88K decks Third Path Iconoclast 37%inclusion 22%synergy 697 decks 1.88K decks Shantotto, Tactician Magician 36%inclusion 34%synergy 684 decks 1.88K decks Vandalblast 36%inclusion 11%synergy 682 decks 1.88K decks Archmage Emeritus 36%inclusion 1%synergy 675 decks 1.88K decks Blasphemous Act 36%inclusion -3%synergy 673 decks 1.88K decks Game Changers Jeska's Will 24%inclusion -5%synergy 453 decks 1.88K decks Cyclonic Rift 19%inclusion -4%synergy 363 decks 1.88K decks Mystical Tutor 12%inclusion -9%synergy 220 decks 1.88K decks Fierce Guardianship 11%inclusion -10%synergy 207 decks 1.88K decks Rhystic Study 8.8%inclusion -14%synergy 165 decks 1.88K decks Ancient Tomb 6.1%inclusion -4%synergy 115 decks 1.88K decks Creatures Vivi Ornitier 31%inclusion 19%synergy 581 decks 1.88K decks Young Pyromancer 28%inclusion 12%synergy 517 decks 1.88K decks Pinnacle Monk 23%inclusion 9%synergy 422 decks 1.88K decks Ultros, Obnoxious Octopus 21%inclusion 21%synergy 399 decks 1.88K decks Molten-Core Maestro 21%inclusion 14%synergy 142 decks 687 decks Ovika, Enigma Goliath 19%inclusion 14%synergy 362 decks 1.88K decks Talrand, Sky Summoner 19%inclusion 4%synergy 349 decks 1.88K decks Sanar, Unfinished Genius 18%inclusion 10%synergy 126 decks 687 decks Ashling, Rekindled 17%inclusion 14%synergy 228 decks 1.34K decks Guttersnipe 16%inclusion -9%synergy 291 decks 1.88K decks Hermes, Overseer of Elpis 15%inclusion 14%synergy 285 decks 1.88K decks Goblin Electromancer 15%inclusion -13%synergy 274 decks 1.88K decks Abstract Paintmage 13%inclusion 6%synergy 84 decks 642 decks Coruscation Mage 13%inclusion -7%synergy 242 decks 1.88K decks Gogo, Master of Mimicry 12%inclusion 11%synergy 224 decks 1.88K decks Stormcatch Mentor 12%inclusion -11%synergy 223 decks 1.88K decks Murmuring Mystic 10%inclusion 3%synergy 193 decks 1.88K decks Spark Double 10%inclusion 5%synergy 190 decks 1.88K decks Balmor, Battlemage Captain 10%inclusion 0%synergy 188 decks 1.88K decks Hydroelectric Specimen 9.4%inclusion 2%synergy 176 decks 1.88K decks Birgi, God of Storytelling 9.1%inclusion -6%synergy 171 decks 1.88K decks Prismari Pianist 8.9%inclusion 4%synergy 61 decks 683 decks Niv-Mizzet, Parun 8.2%inclusion -18%synergy 153 decks 1.88K decks Colorstorm Stallion 8.2%inclusion 5%synergy 56 decks 687 decks Prismari, the Inspiration 8.2%inclusion 0%synergy 56 decks 687 decks Summon: G.F
Meanwhile, Uncivil Unrest is a terrifying red card - a bit pricey on the mana, but the haste-enabling, damage doubling potential is off the charts
Companions did come with deck-building restrictions, but those dont limit their power and consistency in actual games
If, during your declare attackers step, Ursine Monstrosity is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under your control continuously since your turn began (and doesn't have haste), then it doesn't attack
