Though it's hard to depend on, disguising your opponent's top card is a welcome way to disrupt your opponent
Also in the category of user-friendliness, I love always being able to catch a game of Magic s booster draft (where players assemble decks by taking one card out of a pack before passing it to the next person) and sealed deck (where players create decks using the contents of several new packs)
Each pack includes at least one Traditional Foil card
And theres also Ephemerate
Pair it with Guile for an infinite engineevery spell your opponents cast gets countered, gives you birds, and then Guile shuffles it right back in for more
This rules out any Uncommon, Rare, or Mythic Rare cards , allowing those who are not so lucky with their card draws to have an even playing field