There have been plenty of creatures that bleed your opponents out as creatures die, but Blood Artist popularized the ability, and paved the way for an endless wave of clones and spin-offs
But Chandra hadn't looked over her shoulder since Nissa appeared
Survival, Delirium, and Manifest Dread The Survival ability word makes its debut in Duskmourn, and it triggers if a creature with said ability becomes tapped during your second main phase
Where the World Championship decks showcased the strongest strategies and combos from that season, Theme decks and their successors (Starter packs, Guild Kits, Planeswalker Decks, etc.) usually revolve around a specific sets mechanics and act as an introductory product more than anything else
Skatewing Spy This Vedalken Rogue Mutant offers an interesting utility for counter-focused decks