Learn about Magic's archetypes and see how cards from Foundations fit those decks
For example, a Siege card like Invasion of Llorwyn will be exiled and can be cast by the controller without paying its mana cost, even if another player defeated the battle for them
But for the rest, all but the most obsessive optimisers can easily forgo the hip-pocket hit from these cards and grab their value-brand replacements
If the spell has any targets, you may choose new targets for the copy." You may sacrifice only one creature to pay a spell's casualty cost, and you copy the spell only once
There's also a really solid upside here for any kind of enchantment recursion decks, something like Ghen, Arcanum Weaver would work really great with this (or any of the replenish effects)
To determine the best cards of the year can be a bit of a challenge, considering the wide variety of playstyles and preferences everyone has when it comes to the game