Flash
{1}{U/B}, Discard this card: Surveil 1, then draw a card.

Whenever this Subroutine runs, exile the top two cards of your library. You may play one of them this turn.

When this creature enters, mill two cards.
{2}{B/G}{B/G}, Exile this card from your graveyard: Return target creature or enchantment card from your graveyard to your hand.

Level up {1}{W/B}
[level 2-5] Lifelink
[level 6+] Flying, lifelink

You may pay {3}{R/G}{R/G} and sacrifice an artifact or enchantment rather than pay this spell's mana cost.
Trample

Corrupt — When this creature enters, if you control a permanent with greater mana value, it deals 1 damage to any target.

When this creature enters, create a 2/2 blue Bird enchantment creature token with flying.

{2}{R/W}: This creature gets +2/+0 until end of turn.
When this creature dies, create a 1/1 white Citizen creature token.

Whenever this creature attacks, exile up to one target creature card with mana value equal to 1 plus this creature's mana value from your graveyard. This creature becomes a copy of that card, except it has this ability.

Vigilance, haste
Whenever you cast a spell, if its mana value is greater than Xeia's power, put a number of +1/+1 counters on this creature equal to the difference and create a Treasure token.

[–1]: Create a red and green Subroutine enchantment token named SAVE with “Whenever this Subroutine runs, exile the top card of your library. You may play it this turn.”
[–1]: You may sacrifice an enchantment. If you do, search your library for an enchantment card with mana value equal to 1 plus the sacrificed enchantment's mana value, put it onto the battlefield, then shuffle.

Flying
Ward—Discard a card.
You may have this creature enter as a copy of a creature card in your graveyard not named Weft Dancer, except it has flying and “Ward—Discard a card.”

Double strike, menace
Ward—Sacrifice a creature.
Whenever Vijkstra attacks, sacrifice a creature.

Tap another untapped creature you control: Toki gets +1/+1 until end of turn. If that creature had flying, Toki gains flying until end of turn. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance. Activate only as a sorcery.

Whenever a Subroutine you control enters, you may pay {2}. If you do, it runs.
Whenever a Subroutine you control runs, this creature gets +1/+1 until end of turn.

Flying
When this creature enters, exile up to one other target creature or Subroutine. Return that card to the battlefield under its owner's control at the beginning of the next end step. If a creature enters under an opponent's control this way, it enters tapped with a stun counter on it.

Whenever another Subroutine you control enters, it runs.
Whenever this Subroutine runs, create an X/X colorless Construct artifact creature token, where X is the number of Subroutines you control.

Deathtouch
Once during each of your turns, when you sacrifice a nontoken, nonland permanent, you may create a tapped token that's a copy of it.

Whenever you cast an instant or sorcery spell from your hand, cache it instead of putting it into your graveyard as it resolves.

If you would put one or more level counters on a permanent, put that many plus one level counters on it instead.

When this creature enters, choose one —
• Target creature gets +1/+1 until end of turn for each creature and/or enchantment card in your graveyard.
• Target creature gets -1/-1 until end of turn for each creature and/or enchantment card in your graveyard.

Mev can't be blocked by creatures with greater power.
Whenever Mev attacks, draw a card.
Whenever Mev deals damage to a player, that player draws a card.

When this enchantment enters, create two 1/1 white Citizen creature tokens.
Whenever you attack, target attacking creature gets +X/+0 until end of turn, where X is the number of creatures you control that aren't attacking.

Vigilance, ward {1}
Whenever Lio or another enchantment creature you control enters, put a +1/+1 counter on that creature. You gain 1 life and draw a card.

Vigilance, ward {1}
Whenever Lavis attacks, sacrifice any number of artifacts and/or enchantments. Create that many colorless Forest Plains land tokens named Root Node.