msem-instigator

When Undead Archivist enters the battlefield, return target instant or sorcery card from your graveyard to your hand.
Revive {5}{U} ({5}{U}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

When Undead Banneret enters the battlefield, if you control a legendary creature, each opponent loses 4 life.

Creature cards in your graveyard have revive {2}{B}{B}. ({2}{B}{B}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Enchant creature you control
Enchanted creature gets +1/+1.
When enchanted creature dies, return it to the battlefield under your control, then arm it. (Create a colorless Equipment artifact token with “Equipped creature gets +1/+0” and equip {2}, then attach it to that creature.)

Creatures you control have base power 4 and gain trample until end of turn.

Target attacking creature fights another target attacking creature.

Target creature gets -9/-0 until end of turn. Create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

{3}{W}: Exile Vanishing Memory and target creature an opponent controls.

{2}, {T}, Sacrifice Vial of Dragonfire: It deals 2 damage to target creature.

Vial of Ice enters the battlefield tapped.
{1}, {T}, Sacrifice Vial of Ice: Tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

{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

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.

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

When Viork Woods Butcher enters the battlefield, if you control another Warrior, target opponent loses 2 life.

Menace
Whenever a player gains life, that player sacrifices a permanent.

Flying
At the beginning of your end step, if you gained 4 or more life this turn, create a 4/4 white Angel creature token with flying.

When Vitality Reclaimer enters the battlefield, you may return target permanent card from your graveyard to your hand.

Ferocious — When Volcanic Whelp enters the battlefield, if you control a creature with power 4 or greater, Volcanic Whelp gets +3/+0 and gains haste until end of turn.

When Vulpine Cloudchaser enters the battlefield, you gain 1 life and draw a card.
Whenever a creature you control perseveres, you may exile that creature. Return that card to the battlefield under its owner's control at the beginning of the next end step. (A creature perseveres when it survives damage.)

Whenever Wadepool Frog attacks, it gains flying until end of turn.

Wake of the Beast deals 2 damage divided as you choose among one or two targets.
Whenever a creature you control becomes monstrous, you may pay {R}. If you do, return Wake of the Beast from your graveyard to your hand.

Search your library for a basic land card or a Forest card, reveal it, and put it into your hand, then shuffle.
Ferocious — Put the revealed card onto the battlefield instead if you control a creature with power 4 or greater.

Return target creature to its owner's hand. That player can't cast spells with the same name as that creature during their next turn.