I love stuff like Draining Whelk, though
Zul Ashur turns your graveyard into a second hand, making it an engine piece for grindy zombie decks
Winds of Abandon I value Winds of Abandon as a card that flexes between spot removal and a finisher
Rose Tyler + The Tenth Doctor I could go very deep into the doctor and doctors companion cards, but this pairing is by far the most common, and one of the strongest
Atalya, Samite Master Blind Seer Captain Sisay Cromat Crosis, the Purger Darigaaz, the Igniter Dromar, the Banisher Empress Galina Ertai, the Corrupted Gerrard Capashen Hanna, Ship's Navigator Kangee, Aerie Keeper Molimo, Maro-Sorcerer Nemata, Grove Guardian Reya Dawnbringer Rith, the Awakener Tahngarth, Talruum Hero Treva, the Renewer Tsabo Tavoc Verdeloth the Ancient
Attaching this sword to a creature that does first strike damage can give you a very powerful blocker