Hapatra, Vizier of Poisons

Combos:
Ivy Lane Denizen + Devoted Druid + Hapatra = Infinite Mana, Infinite Snakes
+Earthcraft = Haste
Blowfly Infestation + Hapatra/Nest of Scarabs (with 2 1/1 creatures) = Infinite death triggers, infinite -1/-1 placement
+Zulaport Cutthroat/Obelisk Spider = Infinite life drain
+Earthcraft = infinite mana
Yawgmoth + Hapatra = One-sided board wipe, draw a lot of cards
+Young Wolf = unlimited draw
+Ivy Lane Denizen = Near infinite Snakes, Card Draw
+Blowfly Investation = Near infinite Snakes, Card Draw
+Zulaport Cutthroat/Obelisk Spider = Near infinite life drawin
Yawgmoth + Young Wolf + Sadistic Hypnotist + Hapatra = discard opponents hands
Yawgmoth + Young Wolf + Razaketh + Hapatra = unlimited tutor (life limited)
Viridian Longbow + Devoted Druid + Ivy Lane Denizen + Hapatra = infinite damage
Squirrel Nest + Earthcraft

Razaketh Lines:
1 creature out, 1 land drop, Hapatra on board:
Mox Amber -> Life Death -> Gaea's Cradle (tap for at least 6) -> Earthcraft (4 mana + 1) -> Devoted Druid (3 mana + 1) -> Ivy Lane Denizen (0 mana + 1) -> Infinite mana, snakes -> tutor for Hypnotist/Yawgmoth/Spider/Cutthroat (can use Chord and Finale if limited to green mana)
Use Crop Rotation if no more land drop

Yawgmoth + Young Wolf + Zulaport = 3 creatures, 7 mana = infinite draw, life loss
Earth Craft + Devoted Druid + Ivy Lane Denizen = 3 creatures, 6 mana = infinite mana
Earth Craft + Squirrel Nest = 2 creatures, 5 mana = infinite creatures

Mox Amber = +1 Creature, -1 Mana
Mana Crypt = +1 Creature -2 Mana
Gaea's Cradle = +1 Creature, +1 Land Drop, -X Mana
Crop Rotation = +1 Creature, +1 Mana, -X Mana
Life // Death = -X Creatures, +1 Mana

Stax:
Living Planes + any number of -1/-1 counter effects
+Necroskitter = gain control of all lands
Contamination + Meren/Hapatra/Ivy Lane Denizen/Young Wolf/Squirrel Nest
Sadistic Hypnotist

Overperformers:
Earthcraft
Garruk
Eldrazi Monument
Living Plane
Yawgmoth
Command Beacon
Devoted Druid
Natural Order