msem-instigator

The next creature spell you cast this turn may be cast as though it had flash and costs {1} less to cast. If it entering the battlefield causes a triggered ability of it to trigger, that ability triggers an additional time.

Creature tokens you control get +1/+1.
Whenever Thyra, Winter's Warden enters or attacks, you may pay {1}{G/W}. If you do, create Bruga, a legendary 2/2 green and white Wolf creature token.

({T}: Add {G} or {W}.)
Timeless Shrine enters tapped.
{1}, {T}: Add {G}{G} or {W}{W}.

Tinyvale Treetops enters tapped unless you played it from exile.
{T}: Add {G} or {W}.

Vigilance
Permanent spells you cast cost {1} less to cast for each 1 damage Tireless Explorer has dealt to players this turn.

Each creature you control enters with an additional +1/+1 counter on it.
When Training Sim enters, create a Function token with “Target creature you control fights target creature you don't control.” (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)

Equipped creature gets +2/+2 and has hexproof and vigilance.
Equip {2}

Enchant creature
Enchanted creature gets +2/+2 and has vigilance.
{2}{W}: Return Tranquil Endeavors from your graveyard to your hand.

Each player may search their library for a creature card, reveal it, and put it into their hand. Then each player who searched their library this way shuffles it.

Once during each of your turns, you may cast an instant, sorcery, or enchantment spell from your graveyard that targets a creature you control.

{G/W}: If Unlikeliest Heroes doesn't have a +1/+1 counter on it, put a +1/+1 counter on it.
{2}{G/W}{G/W}: If Unlikeliest Heroes has a +1/+1 counter on it and doesn't have vigilance, put two +1/+1 counters and a vigilance counter on it.
{3}{G/W}{G/W}{G/W}: If Unlikeliest Heroes has vigilance and not indestructible, put four +1/+1 counters and an indestructible counter on it.

First mate—There are four or fewer different mana costs among nonland cards in your starting deck. (If this card outside the game is your chosen first mate, you may swap it with a card in your opening hand.)
First strike
Each spell your opponents cast that would cost less than three mana to cast costs {1} more to cast.

If one or more counters would be put on a creature you control, that many plus one of each of those kinds of counters are put on that creature instead.

Venerated Beast can't be blocked by more than one creature.

Each player chooses an artifact or enchantment they control, then sacrifices the rest.

Verdant Sanctum enters tapped unless you control two or more green and/or white permanents.
{T}: Add {G} or {W}.

Level experience, vigilance, trample
Prevent all but the first 1 damage that would be dealt to Verdigris Behemoth each turn. [5/5]
[level 3+] Whenever Verdigris Behemoth deals combat damage to a player, you may destroy target artifact or enchantment that player controls. [7/7]

{G}{W}, {T}: Remove a -1/-1 counter from target creature.
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

When Vitality Maestro enters, you gain 5 life.
Recite {G}{W} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters or if it would leave the battlefield.)

Vigilance
Other Scouts you control get +1/+1 and have vigilance.
{X}, Tap four untapped Scouts you control: Create an X/X green Beast creature token.

({T}: Add {G} or {W}.)
Wandering Hamlet enters tapped unless you control two or more basic lands.

Vigilance, reach
Watchful Authority can block an additional creature each combat.

Target creature you control gets +3/+3 and gains lifelink and trample until end of turn.
Inscribe {3}{G}{W} ({3}{G}{W}: Exile this card from your hand inscribed on a creature you control. Whenever that creature attacks, its controller may cast a copy of the inscribed card without paying its mana cost. Inscribe only as a sorcery.)

Renown 2 (When this creature deals combat damage to a player, if it isn't renowned, put two +1/+1 counters on it and it becomes renowned.)
Each creature you control with a +1/+1 counter on it has indestructible.

Other enchantment creatures you control get +1/+1.
As long as you control three or more enchantment creatures, if a triggered ability of an enchantment you control would trigger, that ability triggers an additional time.