Flying
Whenever Derevi, Empyrial Tactician enters the battlefield or a creature you control deals combat damage to a player, you may tap or untap target permanent.
: Put Derevi onto the battlefield from the command zone.

Exile all creatures.
Delirium — Create a 4/4 white Angel creature token with flying if there are four or more card types among cards in your graveyard.

At the beginning of your upkeep, put a despair counter on Descent into Madness, then each player exiles X permanents they control and/or cards from their hand, where X is the number of despair counters on Descent into Madness.

Destroy any number of target creatures. For each creature destroyed this way, its controller creates a 4/4 red Dragon creature token with flying.

Tap any number of untapped creatures you control. Create a 4/4 white Angel creature token with flying for each creature tapped this way.

Split second
Create four 4/4 red Devil creature tokens with haste and "When this creature dies, create a colorless Treasure artifact token with ', Sacrifice this artifact: Add one mana of any color.'" Sacrifice the Devil tokens at the beginning of the next end step.

Menace, deathtouch
When Dire Fleet Ravager enters the battlefield, each player loses a third of their life, rounded up.

, Exile an instant or sorcery card from your graveyard: Choose one —
• Counter target noncreature spell unless its controller pays .
• Disciple of the Ring gets +1/+1 until end of turn.
• Tap target creature.
• Untap target creature.

As long as it's your turn, this spell costs less to cast.
End the turn. (Exile all spells and abilities from the stack, including this card. The player whose turn it is discards down to their maximum hand size. Damage wears off, and "this turn" and "until end of turn" effects end.)

If one or more creature tokens would be created under your control, that many 4/4 white Angel creature tokens with flying and vigilance are created instead.

Flying
Whenever Do-It-Yourself Seraph attacks, you may search your library for an artifact card, exile it, then shuffle your library.
Do-It-Yourself Seraph has the text box of each card exiled with Do-It-Yourself Seraph in addition to its own.

[+1]: Look at the top card of your library. If it's a creature card, you may reveal it and put it into your hand.
[−2]: Target creature you control fights another target creature.
[−7]: You get an emblem with "Creatures you control have double strike, trample, hexproof, and haste."

[+1]: Add or . If that mana is spent on a creature spell, it gains riot. (It enters the battlefield with your choice of a +1/+1 counter or haste.)
[−3]: Look at the top four cards of your library. You may reveal up to two creature cards from among them and put them into your hand. Put the rest on the bottom of your library in a random order.
[−8]: You get an emblem with "At the beginning of each end step, create a 4/4 red and green Beast creature token with trample."

[+2]: Creatures you control get +1/+1 and gain haste until end of turn.
[−3]: Domri, City Smasher deals 3 damage to any target.
[−8]: Put three +1/+1 counters on each creature you control. Those creatures gain trample until end of turn.

Flying, trample
Pay 2 life: Surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Each creature assigns combat damage equal to its toughness rather than its power.

[+1]: Until your next turn, up to one target creature gets -3/-0 and its activated abilities can't be activated.
[−1]: You gain 2 life and draw a card.
[−7]: You get an emblem with "Your opponents can't untap more than two permanents during their untap steps."

[+1]: You gain 2 life and draw a card.
[−1]: Tap target creature. It doesn't untap during its controller's next untap step.
[−9]: Tap all permanents target opponent controls. That player skips their next untap step.

[+1]: Until end of turn, whenever a creature you control deals combat damage to a player, put a loyalty counter on Dovin, Grand Arbiter.
[−1]: Create a 1/1 colorless Thopter artifact creature token with flying. You gain 1 life.
[−7]: Look at the top ten cards of your library. Put three of them into your hand and the rest on the bottom of your library in a random order.

Dr. Julius Jumblemorph is every creature type (even if this card isn't on the battlefield).
Whenever a host enters the battlefield under your control, you may search your library and/or graveyard for a card with augment and combine it with that host. If you search your library this way, shuffle it.