Survival — At the beginning of your second main phase, if Improvising Aerialist is tapped, Improvising Aerialist and the top creature card in your library without flying perpetually gain flying.

Manifest dread. Then each face-down creature you control gains "This permanent costs less to turn face up" and "When this permanent is turned face up, if it's a creature, put a +1/+1 counter on it."

Discard a card. If you do, seek two cards that don't share a card type with the discarded card.

Flying
When Wingbright Thief enters, target opponent reveals each nonland card in their hand. You choose one of them. That card perpetually gains "When you cast this spell, each opponent draws a card and gains 3 life."

Flying, lifelink
Whenever you gain life, a random creature card in your hand perpetually gets +X/+X, where X is the amount of life you gained.

When this creature enters or dies, exile another creature you control. If you do, conjure a duplicate of a random creature card with mana value X onto the battlefield, where X is 2 plus the exiled creature's mana value.

Each opponent sacrifices a nontoken creature. For each creature sacrificed this way, conjure a duplicate of it into your graveyard.

When Eager Flameguide enters, add . Spend this mana only to cast creature spells.
When Eager Flameguide dies, exile the top two cards of your library. Until the end of your next turn, you may cast creature spells from among the exiled cards.

Wary Zone Guard enters tapped.
Survival — At the beginning of your second main phase, if Wary Zone Guard is tapped, return up to one target land card from your graveyard to the battlefield. Wary Zone Guard perpetually gets +1/+1.

Exile target creature. The exiled card perpetually becomes an enchantment. At the beginning of your next end step, put it onto the battlefield under your control. (It loses all other card types.)