the one that you only open once in a blue moon if you're flush with cash, win it as a prize at your game store, or get as part of the annual Gift Bundle
Princess Power, the Amber/Sapphire combo, is very accommodating for more cautious play as you feel out the game
Phoenixes often synergize with strategies that involve discard, self-sacrifice, or direct damage, making them a natural fit for decks that thrive on aggression and resource recovery
(Whenever it attacks, for each opponent other than defending player, you may create a token copy that's tapped and attacking that player or a planeswalker they control
For this list, Ill talk about the cards that have a major usage rate across the Modern format along with the cards that fit in multiple archetypes, but Ill exclude cards that have been banned or cards that belong to only one deck, like Colossus Hammer