what packs have serialized cards mtg Pulling two from Magic: The Gathering Collector Booster boxes in a week So I guess there's serialized

The card plays offense and gives resources for the late game at the same time

While the exact offerings change from set to set, the ones available for Avatar: The Last Airbender include an exquisite Arena sleeve with one of the set's legends: Pack Bundles $49.99 50x normal boosters, 5x Golden Boosters, 1x pre-selected Mythic, and an associated card style

Not triggering on planeswalkers is definitely a downer, as I wouldve liked to see this singlehandedly stop Saheeli Rai and Felidar Guardian

You can likely guess what fairy tale trope its referencing from the title, but to reinforce the hint it uses a new mechanic, bargain, which gives you a bonus effect if you sacrifice an artefact, token or enchantment