Based on the recent tournament results, I can say the Blue Black Control is the lone Tier 1 control deck for the RIX Standard format. Here is what the Standard Control deck in the current metagame with Rivals of Ixalan looks like. The list below is from a recent MTGO Competitive Standard League.

26 LANDS
4 Drowned Catacomb
4 Fetid Pools
3 Field of Ruin
7 Island
2 Submerged Boneyard
6 Swamp

6 CREATURES
2 The Scarab God
4 Torrential Gearhulk

25 INSTANTS and SORC.
1 Commit / Memory
4 Disallow
4 Essence Scatter
4 Fatal Push
4 Glimmer of Genius
1 Hieroglyphic Illumination
3 Moment of Craving
4 Vraska’s Contempt
3 OTHER SPELLS
2 Search for Azcanta
1 Treasure Map

SIDEBOARD
1 Arguel’s Blood Fast
1 Bontu’s Last Reckoning
1 Commit / Memory
3 Contraband Kingpin
1 Deadeye Tracker
3 Duress
1 Golden Demise
1 Moment of Craving
2 Negate
1 Nezahal, Primal Tide