Aegar, the Freezing Flame

Return target creature card from your graveyard to the battlefield. If it's an Elf, create two 1/1 green Elf Warrior creature tokens. Foretell 3B (During your turn, you may pay 2 and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Exile target artifact, creature, or enchantment an opponent controls. That player may put a permanent card from their hand onto the battlefield.

Whenever Jorn attacks, untap each snow permanent you control.

Trample Crew 2 (Tap any number of creatures you control with total power 2 or more: This Vehicle becomes an artifact creature until end of turn.) Sacrifice two Treasures: Return this card from your graveyard to your hand.

Changeling (This card is every creature type.) 2G, T, Exile a creature card from your graveyard: Put two +1/+1 counters on target creature. Activate only as a sorcery.

T: Add G.

When Niko Aris enters, create X Shard tokens. (They're enchantments with "2, Sacrifice this token: Scry 1, then draw a card.") +1: Up to one target creature you control can't be blocked this turn. Whenever that creature deals damage this turn, return it to its owner's hand. −1: Niko Aris deals 2 damage to target tapped creature for each card you've drawn this turn. −1: Create a Shard token.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.) I — You gain 2 life for each foretold card you own in exile. II — Add WU. Spend this mana only to foretell cards or cast spells that have foretell. III — Return target card with foretell from your graveyard to your hand.