Green White Death & Taxes, updated to Modern Horizons.
Sideboard guide:
ELDRAZI TRON:
OUT: -2 Scooze, -4 Vial, -2 Thalia
IN: +1 Spyglass, +3 Teeg, +2 Ouphe, +2 Winds
TRON:
OUT: -2 Scooze, -4 Vial
IN: +1 Spyglass, +3 Teeg, +2 Ouphe
UR PHOENIX:
OUT: -4 Arbiter, -3 Splicer
IN: +3 RiP, +2 Winds, +2 Eidolon
MONO R PHOENIX:
OUT: -4 Arbiter, -3 Wisp
IN: +3 RiP, +2 Winds, +2 Eidolon
BURN:
OUT: -4 Wisp
IN: +2 Eidolon, +1 Thrun, +1 Spyglass
DREDGE:
OUT: -3 Knight, -2 Wisp
IN: +3 RiP, +2 Winds
HOGAAK VINE:
OUT: -3 Knight, -3 Thalia
IN: +3 RiP, +2 Winds, +1 Eidolon
HUMANS:
OUT: -2 Thalia, -2 Arbiter
IN: +1 Gideon, +2 Winds, +1 Thrun
DEVOTED DEVASTATION/COMPANY:
OUT: -3 Knight, -1 Scooze
IN: +3 Teeg, +1 Spyglass
MARDU PYRO:
OUT: -4 Vial, -3 Knight
IN: +3 RiP, +2 Winds, +1 Gideon, +1 Thrun
JUND:
OUT: -4 Vial, -3 Knight
IN: +3 RiP, +1 Spyglass, +1 Gideon, +2 Winds
UW CONTROL:
OUT: -2 Scooze, -3 Knight, -1 Path
IN: +1 Spyglass, +3 Teeg, +1 Thrun, +1 Gideon
URZA THOPTERSWORD:
OUT: -4 Vial, -2 Wisp
IN: +2 Ouphe, +1 Spyglass, +3 RiP
AFFINITY:
OUT: -4 Arbiter
IN: +2 Ouphe, +1 Spyglass, +1 Winds
HARDENED SCALES:
OUT: -4 Arbiter, -2 Scooze
IN: +3 RiP, +2 Ouphe, +1 Spyglass
INFECT:
OUT: -2 Scooze, -3 Giver
IN: +2 Winds, +2 Eidolon, +1 Spyglass
AMULET TITAN:
OUT: -2 Scooze, -2 Giver (if Karn)
IN: +1 Spyglass & +1 Winds (if Druid/Vizier) / +2 Winds (if not Druid/Vizier), +2 Teeg (if Karn)
TITANSHIFT:
OUT: -2 Scooze, -2 Knight
IN: +1 Spyglass, +3 Teeg
SAHEELI COPYCAT:
OUT: -3 Knight
IN: +1 Spyglass, +1 Thrun, +1 Gideon
DEATH AND TAXES:
OUT: -3 Thalia, -1 Arbiter
IN: +2 Winds, +1 Thrun, +1 Gideon
TWIDDLE STORM:
OUT: -4 Arbiter
IN: +2 Eidolon, +2 RiP
