Infinite landfall (multiple ways):
Sakura-Tribe Scout & Skyshroud Ranger each can tap to let you play an additional land.
Retreat to Coralhelm
can use the landfall from that to untap a Scout/Ranger.
Tideforce Elemental
can use the landfall to untap itself, and then tap itself and use a mana from the new land to untap a Scout/Ranger.
We now have the ability to play infinite lands, we just need infinite lands to play.
Two mana to a Oboro Breezecaller lets us return a land to our hand, and to untap another land. The mana from tapping both the land to be returned, and the one untapped can pay for doing this again, letting us do this infinitely if we're using Coralhelm to untap the Scout/Ranger.
If one of the two lands is a Simic Growth Chamber, we can afford to use the Elemental to untap the Scout/Ranger.
Alternatively, we can pay one mana to
Trade Routes
to return a land to out hand. So long as we tap this land before we return it, that'll give us the mana to do this infinitely with Coralhelm, or if the land is a Growth Chamber it'll pay for using the Elemental.
Alternatively, if we're using the retreat to untap, then we can use a pair of Simic Growth Chambers to bounce each other.So, we can play a land and return a land to our hands in an infinite loop = infinite landfall!
Jaddi Offshoot
can use that to give us infinite life.
If Radiant Fountain is the land being bounced, that'll give us infinite lie.
Retreat to Coralhelm
, or a second copy if we're using one to untap the Scout/Ranger, can use that to give us as many Scry 1 as we need to make the next card exactly what we want, untap all our creatures, and tap all our opponent's creatures.
Altar of the Brood can use it to mill the opponent's entire deck.
Hedron Crab can use that to mill the opponent's entire deck.
If we get the combo for infinite life, but then our opponent breaks it before we get what we need to mill, crab &/or altar should still win the game unless our opponent is playing infect.
