Whenever Agent Frank Horrigan enters or attacks, proliferate twice
Azorius and Jund: Ezrim, Agency Chief and The Fugitive Doctor & Clara Oswald Dimir and Naya: Eloise, Nephalia Sleuth and Elmar, Ulvenwald Informant & Sophina, Spearsage Deserter Gruul and Esper: Jaheira, Friend of the Forest & Street Urchin and Inquisitor Greyfax Selesnya and Grixis: Cadira, Caller of the Small and The Rani Izzet and Abzan: Glacian, Powerstone Engineer & Dargo, the Shipwrecker and Wernog, Riders Chaplain & Othelm, Sigardian Outcast Golgari and Jeskai: Ich-Tekik, Salvage Splicer & Keskit, the Flesh Sculptor and The Fifteenth Doctor & Sarah Jane Smith thats a lot of partner pairs
It is also the only non-blue way of putting cards from your hand back on top of your library
Eldrazi Tribal: Final Power Level The definitive evaluation of the Kozilek Apocalypse build
2B, Sacrifice Nim Replica: Target creature gets -1/-1 until end of turn
Being able to reliably remove this from your command zone opens up all kinds of avenues and dramatically improves certain cards