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Demonstrate has not been widely used in EDH precons, and there are only a few cards with the keyword

Force of Vigor is better artifact/enchantment destruction than Foundation Breaker imo

its now emerged as the biggest force in the Western metagame as well

Easy access to all five colors will make it that much easier to cast The Prismatic Bridge, which will cheat a creature or planeswalker onto the battlefield on your upkeep

This effect can definitely play in a Vintage Cube, though it would have to be a slightly unconventional one with better support for black aggressive decks than we see in the current digital offerings