Darksteel introduced affinity for basic lands, and Modern Masters and Modern Masters 2015 had affinity cards reprinted as one of the draftable themes
For example, if a creature dies during combat on your turn and you cast Muster the Departed during your second main phase, its last ability will trigger at the beginning of your end step
This basically allows you to be really aggressive, lean into a lesser-known tribe, and also play with the discard theme all at once
Magic: The Gathering 's newest Standard set, Streets of New Capenna , has proven itself to be powerful in multiple formats
Sneaky answers include things like Kheru Spellsnatcher , who can steal a spell for its morph cost, and Trygon Predator , who can conceal its true identity as a 2/2 face-down card until it's time to spring into action to destroy an artifact or enchantment