Azorius Herald can't be blocked.

When Azorius Herald enters the battlefield, you gain 4 life.

When Azorius Herald enters the battlefield, sacrifice it unless was spent to cast it.

, : Draw a card.

, Sacrifice Centaur's Herald: Create a 3/3 green Centaur creature token.

Whenever you cast a nonlegendary creature spell with flying, you may copy it, except the copy is a 1/1 Spirit in addition to its other types. Do this only once each turn. (The copy becomes a token.)

Whenever you cast a spell from exile or a land enters the battlefield under your control from exile, create a 2/2 green Wolf creature token.

, , Discard a card: Exile the top card of your library. You may play it this turn.

When Forerunner of the Heralds enters the battlefield, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top.

Whenever another Merfolk enters the battlefield under your control, put a +1/+1 counter on Forerunner of the Heralds.

+1: Reveal the top card of your library. If it's a creature card, put it into your hand. Otherwise, put it on the bottom of your library.

−2: Target creature you control deals damage equal to its power to another target creature.

−7: Until end of turn, creatures you control gain "You may have this creature assign its combat damage as though it weren't blocked."

Outlast (, : Put a +1/+1 counter on this creature. Outlast only as a sorcery.)

Whenever you activate Herald of Anafenza's outlast ability, create a 1/1 white Warrior creature token.

Vigilance

Other Warrior creatures you control have vigilance.

Circle of Death — : Roll a d20.

1–9 | Each opponent loses 2 life.

10–19 | Each opponent loses 2 life and you gain 2 life.

20 | Each opponent loses 2 life and you gain 2 life. Create two Treasure tokens. (They're artifacts with ", Sacrifice this artifact: Add one mana of any color.")

Trample

Whenever you cast a creature spell, put two +1/+1 counters on Herald of Ilharg. If that spell has mana value 5 or greater, Herald of Ilharg deals damage equal to the number of counters on it to each opponent.

Flying

Cumulative upkeep—Gain control of a land you don't control. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

Herald of Leshrac gets +1/+1 for each land you control but don't own.

When Herald of Leshrac leaves the battlefield, each player gains control of each land they own that you control.

Flying, vigilance

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

When Herald of the Dreadhorde dies, amass Zombies 2. (Put two +1/+1 counters on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

Flying

When Herald of the Forgotten enters the battlefield, if you cast it, return any number of target permanent cards with cycling abilities from your graveyard to the battlefield.

Enchantment spells you cast cost less to cast.

Whenever you cast an enchantment spell, you gain 1 life.

Bestow (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)

Flying

At the beginning of your upkeep, you lose 1 life.

Enchanted creature gets +3/+3 and has flying.

Flying

Whenever Herald of War attacks, put a +1/+1 counter on it.

Angel spells and Human spells you cast cost less to cast for each +1/+1 counter on Herald of War.

As Herald's Horn enters the battlefield, choose a creature type.

Creature spells you cast of the chosen type cost less to cast.

At the beginning of your upkeep, look at the top card of your library. If it's a creature card of the chosen type, you may reveal it and put it into your hand.

Mist-Cloaked Herald can't be blocked.

At the beginning of combat on your turn, target enchanted creature or enchantment creature you control gets +1/+1 and gains trample until end of turn.

Vigilance

When River Herald Guide enters the battlefield, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

Put a +1/+1 counter on target creature and a +1/+1 counter on up to one target Merfolk.

, , Sacrifice a white creature, a blue creature, and a black creature: Search your library for a card named Sphinx Sovereign, put it onto the battlefield, then shuffle.

Flying

Whenever Victory's Herald attacks, attacking creatures gain flying and lifelink until end of turn.

Flash (You may cast this spell any time you could cast an instant.)

You may cast green creature spells as though they had flash.