Took a list a few cards off this one to Legacy this week, it was a lot of fun and Harness Infinity won me a game.

Combo
3 Shigeki, Jukai Visionary
3 Colossal Skyturtle

Mana
4 Dictate of Karametra
4 Early Harvest
1 Turnabout

Ramp
4 Growth Spiral
4 Joint Exploration
1 Atarka's Command

Dig/Tutor
4 Grisly Salvage
4 Brainstorm
1 Forbidden Alchemy
1 Mystical Teachings

Graveyard
1 Noxious Revival
1 Bound // Determined
1 Harness Infinity

Lands
2 Verdant Catacombs
2 Misty Rainforest
2 Wooded Foothills
1 Taiga
1 Bayou
1 Volcanic Island
1 Underground Sea
1 Tropical Island
4 Forest
3 Island
3 Swamp
1 Mountain

Sideboard
4 Endurance
4 Summer's Veil
4 Force of Negation
2 Abrupt Decay
1 Memory's Journey

The combo is pretty straightforward, Shigeki+Turtle+Harvest or Shigeki+Noxious+cantrip+Harvest for infinite mana and infinite recursion of every card.

+The entire deck is instant speed, including the land drops
+The wincon gets under hexproof and infinite life
+The actual combo is uncounterable and unaffected by cast restrictions
+Alternate wincon of flying turtles is pretty solid
+Most of the combo is self-resilient
+(Mostly) Basic manabase semi-blanks Wasteland
+You get to play beautiful $2 extended art foils of Harness Infinity

-You have to play bad cards
-You won't win any games


Lots of potential number shuffling and card choices; Force of Vigor is decent in the sb, Veils can be maindeck in a blue meta, Pact of Negation (and possibly Summoner's Pact) are very strong if you stay instant speed, whereas Uro is basically a must-include if you don't.

Deck is too slow to be competitive, but very fun and pleasant to pilot. Every card is beautiful and nature themed and you can build almost the entire maindeck for pennies in foiled special arts. My deck is almost entirely foil, extended/foil art when possible, Spiral and Brainstorm are each 4 different foil arts. Shocks are also very viable here, so that helps the budget immensely. There's tons of accidental tech and elegant overlap, and fully-instant decks have always been a soft spot of mine.