mtg put card on top of library Sylvan - Single Library of Leng (Masters Edition

Samwise has two cards in the set and a third released with the Lord of the Rings Commander decks

This amazing black artifact lets you play cards from the top of your library, and since its an artifact, you can cheat it into play with cards like Tinker or Daretti, Scrap Savant

Making land drops is already powerful, so a mechanic that enhances them often trends towards being broken

It also is a newer idea that design is working on that scales on the number of opponents you have

It might not be up to snuff stat-wise, but that ability will let you finish off any low-powered creatures or sneak some damage through to your opponents

It fits the character perfectly, it balances the cards power level and casting costs pretty well, and it can ultimately be broken in really absurd ways