msem-instigator

Reveal the top card of your library. You may put it on the bottom of your library. Target creature gets -X/-0 until end of turn, where X is that card's mana value.

Creatures with power equal to the number of cards in your hand can't attack.

{T}: Add {C}.
{T}, Sacrifice Shiftscape Grove: Choose a basic land type other than Forest. Create a colorless land token that's a Forest and the chosen basic land type. Activate only during your upkeep.

Counter target spell unless its controller pays {1}. If you control an artifact, instead counter that spell unless its controller pays {4}.

Whenever Luna enters or phases in, each player loses 1 life.
Whenever a player casts a spell or a creature attacks, Luna phases out.

Flash
Embellish {5}{U} (If you cast this spell for {5}{U}, create a 1/1 blue Thopter artifact creature token with flying when it enters.)
Whenever Vectis Entrancer or another artifact you control enters, tap target creature an opponent controls. It loses all abilities until end of turn.

{T}: Add one mana of any color.
{4}, {T}, Sacrifice Prototype Engine: Put four -1/-1 counters on target creature.

Whenever Almgrove Bladesinger attacks, harmonize. (Trigger up to one harmony of a permanent you control.)
Harmony — Target creature can't block this turn.

When Feralborn Druid enters, create two 2/2 green Wolf creature tokens.
Feralborn Druid gets +1/+1 for each Wolf you control.

The Urchin King's power and toughness are each equal to the number of cards in all graveyards.
Sacrifice a creature: The Urchin King gains lifelink and indestructible until end of turn.

Engorge (As this enters, mill three cards, then exile a card from among the milled cards.)
When Bane of Sanity enters, if it engorged a creature card, target player discards two cards.

This spell can't be countered.
Destroy target nonbasic permanent.

If a card would be put into an opponent's graveyard from anywhere, instead that card is revealed and put on the bottom of that player's library.
Unveil {3}{G}{W} ({3}{G}{W}: Transform this. Unveil only as a sorcery.)

{T}: Scry 1.
{1}{U}, {T}: Draw a card.

Return target tapped creature to its owner's hand. (Then exile this card. You may cast the creature later from exile.)

Lifelink
Other creatures you control enter with an additional +1/+1 counter on them.
{2}{G}{W}: Nourish 1. (To nourish 1, either put a +1/+1 counter on this creature or create a 1/1 white Citizen creature token.)

When Spiked Burrower dies, if it didn't have a counter on it, return it to the battlefield under your control with a +1/+1 counter or a lifelink counter on it.

{1}{G}: Night's Guard gets +2/+2 until end of turn. Activate only once each turn.

At the beginning of your upkeep, scry 1, then you gain 1 life.

Vigilance
Menagerie — When Hoof Cliff Trihorn enters, if there are five or more creature types among creatures you control, you may search your library for a card named Hoof Cliff Trihorn, reveal it, put it into your hand, then shuffle.

Haste (This creature can attack and {T} as soon as it comes under your control.)

Whenever you cast an instant or sorcery spell, you may pay {1}. If you do, choose one—
• Draw a card, then discard a card.
• Tap target creature.
• Target creature gains flying until end of turn.
• Target player mills two cards.

Deathtouch
Whenever a creature dealt damage by Rabid Rodent this turn dies, put a +1/+1 counter on Rabid Rodent.
{2}, Remove a +1/+1 counter from Rabid Rodent: Regenerate Rabid Rodent.

When Candlecrown Stag enters, choose one or both —
• Exile target card from a graveyard.
• You gain 3 life.

Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
At the beginning of each end step, scry X, you gain X life, and Nakia, Infinity Seer deals X damage to up to one target creature or planeswalker, where X is the number of noncreature spells you've cast this turn.