Target creature you control gains protection from the color of your choice until end of turn.
Scry 1.

Target creature gains hexproof until end of turn. Teach it vigilance.

Exile target creature. Tap up to two other target creatures if the exiled creature had power 3 or less.

When this Subroutine enters, you may discard a card. When you do, it deals 4 damage to target creature or planeswalker.
Whenever this Subroutine runs, create a 4/4 red Error creature token with menace.

Flash
When Benthalos of Land and Sea enters, you may cast a copy of target white or blue enchantment you control.

Aethersteel Pouncer enters with a haste counter on it.

Flying, vigilance
{W}, {T}: Tap target creature.

Damned — Whenever this creature attacks, put a +1/+1 counter on it if you've sacrificed a permanent this turn.
When this creature dies, it deals damage equal to its power to each opponent.

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

Landfall — Whenever a land you control enters, make a pledge.

Flash
Enchant creature
Enchanted creature can't attack or block.

{T}: Create a Treasure token.
{T}, Sacrifice a Treasure: Put a +1/+1 counter on target creature. Activate only as a sorcery.
{T}, Sacrifice two Treasures: Create a 0/0 colorless Robot artifact creature token with four +1/+1 counters on it. Activate only as a sorcery.
{3}: Untap Subsidized Market.

Integrate target permanent spell.

When Smiling Sludge enters, create a Berry token.
Whenever you sacrifice a nonland permanent, target opponent loses 1 life and you gain 1 life.

Tiril District enters tapped unless you control a Plains, an Island, and a Swamp.
{T}: Add {W}, {U}, or {B}.

Approval — Counter target noncreature spell unless its controller pays {X}, where X is the number of colors among permanents you control.

Teslahammer Giant enters with a +1/+1 counter on it.

Flying
When Civic Copterist enters, teach target creature flying.

This artifact enters tapped.
{T}: Add one mana of any color. Spend this mana only to cast Subroutine spells.
{4}, {T}: Draw a card. This ability costs {1} less to activate for each time a Subroutine ran under your control this turn.

Whenever another creature you control enters, you may pay {X}{X}. If you do, put X +1/+1 counters on that creature.
{T}: Add one mana of any color.

Target player discards two cards and loses 2 life. If this spell's flashback cost was paid, instead that player discards a card and loses 1 life.
Flashback {B}

Gain control of target creature. Untap it. It gains trample and haste until end of turn. Sacrifice it at the beginning of the next end step.
Cycling {2}

Decayed
{1}{B}, Exile Expendable Medic from your graveyard: Return target creature card from your graveyard to your hand. Activate only as a sorcery.

Whenever you play a card with mana value equal to the number of charge counters on Gilded Font, put a charge counter on it.
{2}, Sacrifice Gilded Font: You draw X cards and gain twice X life, where X is the number of charge counters on Gilded Font.

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle. Then if you control three or more enchantments, draw a card.