Flying
Spells your opponents cast that target Terror of the Peaks cost an additional 3 life to cast.
Whenever another creature enters the battlefield under your control, Terror of the Peaks deals damage equal to that creature's power to any target.

Flying
Whenever you cast a historic spell, return target creature card with converted mana cost 3 or less from your graveyard to the battlefield. (Artifacts, legendaries, and Sagas are historic.)

Flying
When you control no enchantments, sacrifice Tethered Griffin.

Flying
Whenever Tethered Skirge becomes the target of a spell or ability, you lose 1 life.

Flying
Tetravus enters the battlefield with three +1/+1 counters on it.
At the beginning of your upkeep, you may remove any number of +1/+1 counters from Tetravus. If you do, create that many 1/1 colorless Tetravite artifact creature tokens. They each have flying and "This creature can't be enchanted."
At the beginning of your upkeep, you may exile any number of tokens created with Tetravus. If you do, put that many +1/+1 counters on Tetravus.

Vigilance, protection from creatures
Whenever a creature deals combat damage to you, destroy that creature. Create a 1/1 white and black Spirit creature token with flying.

Sacrifice three white creatures: Exile target creature.
Whenever another black creature you control dies, create a 1/1 white Spirit creature token with flying.

[+1]: Create a 1/1 colorless Thopter artifact creature token with flying.
[0]: Draw a card. If you control three or more artifacts, draw two cards instead.
[−9]: You get an emblem with "At the beginning of your end step, search your library for a permanent card, put it onto the battlefield, then shuffle your library."

Lifelink
Whenever you cast a spell from your graveyard, create a 1/1 white Spirit creature token with flying.
Sacrifice a Spirit: Thalia's Geistcaller gains indestructible until end of turn.

At the beginning of each end step, create X 1/1 white Spirit creature tokens with flying, where X is the number of tokens you created this turn.

Flying
When Thaumaturge's Familiar enters the battlefield, scry 1.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — The First Eruption deals 1 damage to each creature without flying.
II — Add .
III — Sacrifice a Mountain. If you do, The First Eruption deals 3 damage to each creature.

Flying, lifelink
Whenever The Haunt of Hightower attacks, defending player discards a card.
Whenever a card is put into an opponent's graveyard from anywhere, put a +1/+1 counter on The Haunt of Hightower.

, : Create a 1/1 colorless Insect artifact creature token with flying named Wasp. (It can't be blocked except by creatures with flying or reach.)

Flying
Whenever you draw a card, create a 1/1 blue and red Insect creature token with flying and haste.
: Draw a card, then discard a card.
When The Locust God dies, return it to its owner's hand at the beginning of the next end step.

Flying, trample
Whenever The Unspeakable deals combat damage to a player, you may return target Arcane card from your graveyard to your hand.

Eminence — As long as The Ur-Dragon is in the command zone or on the battlefield, other Dragon spells you cast cost less to cast.
Flying
Whenever one or more Dragons you control attack, draw that many cards, then you may put a permanent card from your hand onto the battlefield.

Creatures with flying get +2/+0.
Creatures without flying get -2/-0.
Whenever you roll {CHAOS}, target creature gains flying until end of turn.

Flying, protection from red

Sacrifice an artifact: Thermal Navigator gains flying until end of turn.