msem-instigator

{T}, Sacrifice Vibrant Rainforest: Search your library for a Mountain or Forest card and put it onto the battlefield tapped, then shuffle.

You may play Vibrant Sandbar from your graveyard as long as seven or more cards are in your graveyard.
Vibrant Sandbar enters the battlefield tapped.
{T}: Add {R} or {G}.
Cycling {1}{R}{G} ({1}{R}{G}, Discard this card: Draw a card.)

Flying, protection from Dragons

Menace
When Vicious Stinger dies, each opponent loses 2 life. You gain life equal to the life lost this way.

When Victims of Graygulch enters the battlefield, target player loses life equal to the number of Spirits you control. You gain life equal to the life lost this way.

{T}: Add {C}.
{T}: Add one mana of any color. Activate only if you control a creature with a +1/+1 counter on it.

Vigilance
{6}: You may tap or untap target creature.

Equipped creature gets +1/+3.
Whenever another creature blocks or becomes blocked by equipped creature, that creature loses all abilities until end of turn.
Equip {3}

Exile the top two cards of your library and put a blood counter on each of them. Until the end of your next turn, you may play cards you own in exile with blood counters on them.
Tether (Then if you cast this from your hand, you may exile it tethered to a creature you control. When it dies, you may cast this from exile without paying its mana cost.)

Vigorbreath Scourge enters the battlefield with X +1/+1 counters on it.
Whenever Vigorbreath Scourge attacks, it gets +X/+X until end of turn, where X is your devotion to green. Then if its power is 6 or greater, draw a card. (Each {G} in the mana costs of permanents you control counts toward your devotion to green.)

{2}{G}, {T}: Another target creature you control gets +2/+2 until end of turn.

Alpha (You may have this creature enter the battlefield with a +1/+1 counter on it. If you do, it becomes alpha and can only attack alone.)
Vigilance

Kicker {1}{G} (You may pay an additional {1}{G} as you cast this spell.)
When Vigorous Tracker enters the battlefield, if it was kicked, search your library for a land card, reveal it, put it into your hand, then shuffle.

When Viking Greataxe enters the battlefield, attach it to target creature you control.
Equipped creature gets +2/+1.
Equip {3}

Dominance — When Viking Packleader enters the battlefield, create a 2/2 green Wolf creature token if you control the creature with the greatest power or tied for the greatest power.

Target player sacrifices a creature.
Create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)

Whenever you cast a spell during an opponent's turn, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

When Vile Weavers enters the battlefield, if you control an enchantment, target player loses 3 life.

When Village Courier enters the battlefield, look at the top four cards of your library. You may reveal an artifact, enchantment, or land card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Target opponent exiles two cards from their hand. If that player is cursed, they lose 3 life.

Tithe (When this creature enters the battlefield, you may tap three other artifacts and/or creatures you control.)
When Vindictive Abbot enters the battlefield, you may have target creature get -1/-1 until end of turn. If Vindictive Abbot's tithe was paid, destroy that creature.

Rhapsody {3}{R}{R} (Pay {3}{R}{R} to cast this as a 4/4, or as a sorcery to make it become a 4/4.)
Whenever Vindictive Guardian or another creature enters the battlefield under your control, if that creature's power is 4 or greater, create a Treasure token.

Whenever Vindictive Pyromancer perseveres, it deals 1 damage to any other target. (A creature perseveres when it survives damage.)

Flying, lifelink
Whenever a creature you control dies, Vindictive Regent gets +1/+1 until end of turn.
At the beginning of your end step, if you gained 3 or more life this turn, each opponent sacrifices a creature.