Shiko, Paragon of the Way was my rediscovering the way of Control decks in a Tarkir Standard, as this card almost clinched my first Pro Tour Invite at RC Minneapolis
Thieves Guild Enforcer has been putting some real work in for the Standard Rogues deck, and can looks fairly innocuous at first but plays multiples roles of milling your opponent, whilst also attacking and blocking excellently a bit later in the game when their graveyard is stocked full
Another option is to force your opponents to discard their entire decks , though milling a 99-card library is a daunting task and requires more set-up than card do damage or creature go smack
10 Liliana, the Necromancer Liliana, the Necromancer is pretty much a better version of Liliana, Death Mage
Eldlich is a very simple deck to learn and even master, and relies on spell and trap cards to lock the opponent out of the game by denying them turns