Down in the Valley

The Saga can repeatedly create Elf tokens through landfall, with each token reducing Cantankerous Keepers' cost. Keepers then joins the Elf board that receives the Saga's later power and vigilance bonuses.

Casting Through the Forest Gate while the Saga has its landfall ability can put numerous lands onto the battlefield simultaneously, creating an Elf token for each one before the later chapters pump the resulting board.

Bard doubles every Elf token created by the Saga's landfall ability, rapidly building a much larger board for chapters III and IV to pump.

Each Elf token created by the Saga gives Woodland Weavemaster +1/+1 for the turn, increasing the amount of Elf-only mana it can produce; multiple landfall triggers can make that burst substantial.

The Saga supplies another Elf to enable Thranduil's Company's additional land play and finds a land to use with it; each land then triggers both permanents, creating an Elf and placing two +1/+1 counters.

Chapter I finds a basic land to secure a future Hospitality trigger, while subsequent land drops also create Elf tokens that provide additional bodies on which to place Hospitality's counters.

Once chapter II grants the Saga Landfall, Wood Elves immediately puts a Forest onto the battlefield to create an Elf token; Wood Elves and that token also benefit from the later Elf-wide chapters.

The Reveler's land-to-battlefield loot and recursion churn out the land drops that the Saga's chapter II converts into Elf tokens.

The Saga finds a land and later makes your land drops produce Elves — every land is doing double duty with the Raft-Steerer out.

Down in the Valley supplies 1/1 Elf tokens that Galion can turn into 4/4 attackers, while its later chapters grant those Elves additional power and vigilance.

After Down in the Valley gains landfall, Roll-Roll-Roll-Roll can repeatedly blink one of your lands; each return creates another Elf token while preserving your normal land drop.

Gone Fishing can blink two lands after the Saga gains landfall, immediately generating two Elf tokens in addition to any token made by your normal land drop.

The Saga finds a land to keep Pathmaker's land-scaled stats growing, while Pathmaker is itself an Elf that receives the power and vigilance bonuses from chapters III and IV.

Once the Saga gains its Landfall ability, every land creates one Elf from each permanent. Thranduil's anthem makes all of those tokens larger, while the Saga's later chapters further boost the rapidly expanding Elf board.

The land secured by chapter I guarantees a future turn where both landfall abilities trigger, creating an Elf and a 2/2 Bear from the same land; extra land drops multiply both token engines.

Once the Saga has gained landfall, sacrificing Troop of Ponies puts a basic land directly onto the battlefield to create an Elf token while also supplying another land for a later land drop.

Elven Passage fetches a basic directly onto the battlefield to trigger the Saga's landfall ability, and the Saga's Elf tokens make it easy to behold an Elf so that basic enters untapped.

Each Elf token made by the Saga triggers Belladonna Took, and turns with multiple land entries can advance through her life, card-draw, and team-counter rewards in a single turn.

Mirkwood Nurturer can return Down in the Valley to hand so it can be replayed for another basic land and another sequence of token-making and Elf pumps; as an Elf, the Nurturer also receives the chapter III and IV bonuses.

Till and Tend grants an additional land play, letting the land found by chapter I and another land each generate separate Elf tokens after the Saga gains landfall.

Sacrificing Hobbit Hole puts a basic land directly onto the battlefield, producing an Elf token from the Saga without using the normal land play for the turn.