Sacrifice an Aura or Equipment attached to a creature you control: That creature gains indestructible until end of turn.

{1}{B}: Exile target card from a graveyard. If it's a creature card, investigate.
Whenever you sacrifice a Clue, each opponent loses 1 life.

First strike
Players can't gain life.
Whenever a player casts a spell from a graveyard or exile or activates an ability of a card in a graveyard or exile, Vigilante Firebug deals 2 damage to that player.

Enchant creature
Enchanted creature gets +1/+1 and has vigilance and reach.
If enchanted creature would die, instead sacrifice Vigor of the Wilds and it gains indestructible until end of turn.

Exile the top X cards of your library. When you do, choose one —
• Until the end of your next turn, you may play cards exiled this way.
• Villain's Gambit deals damage to any target equal to the number of cards exiled by Villain's Gambit.

When Vine Street Stoolie dies, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Endgame
Equipped creature gets +2/+0.
Sacrifice Viridian's Trusty Sidearm: Equipped creature gains indestructible until end of turn. If you're in your endgame, draw a card.
Equip {1}

Deathtouch
When Voidmist Prodigy enters, you may sacrifice a creature. When you do, target opponent loses 3 life and you gain 3 life.

{U}: Volatile Sergeant gets +0/+1 until end of turn.
{R}: Volatile Sergeant gets +1/+0 until end of turn.

When Vow of Silence enters, exile target creature an opponent controls with power 3 or less until Vow of Silence leaves the battlefield.

You may cast target instant or sorcery card from your graveyard this turn. If that card would be put into your graveyard this turn, exile it instead.
Add one mana of any color for each time you've amped it up this turn.

Target artifact or creature you control becomes an artifact creature with base power and toughness 5/5 until end of turn.

Deathtouch
When Waking Pollution enters, you may move all counters from target permanent onto Waking Pollution.

Choose one —
• Walk the Dead's Path deals 3 damage to target attacking or blocking creature.
• Destroy target enchantment.

Defender
When Wall of Blossoms enters, draw a card.

Defender
When Wall of Heroes enters, tap target creature you don't control. That creature doesn't untap during its controller's next untap step.

Defender
When Wall of Mysteries enters, draw a card.

When this Rift enters or is traversed, look at the top three cards of your library. You may reveal a creature or land card and put it into your hand. Put the rest on the bottom of your library in a random order.
Traverse 2

War-Clan Dowager gets +1/+1 as long as you control another Centaur.

Create two 1/1 white Warrior creature tokens.

Flash
Flying
If an effect an opponent controls would cause them to take an extra turn, you take an extra turn instead.
{G}{U}: Return a creature you control to its owner's hand. Activate this ability only once each turn.

Target creature gets +4/-2 until end of turn.

Whenever you surveil, you may have Watcher's Roost become a 3/3 Bird creature with flying until end of turn.
{2}{U}: Surveil 1.

Once each turn, when you cast an instant or sorcery spell, you may create a 1/0 blue Elemental creature token.
Elementals you control get +1/+1.
{2}{U}, Sacrifice an Elemental: Tap up to one target creature. Scry 1.

When Wayward Drek enters, create a 1/1 colorless Cyborg artifact creature token.
Cybersoul {3}{W/B}