River Heralds' Boon

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Here are cards with similar text to River Heralds' Boon:

Favored Enemy

Enchantment

As Favored Enemy enters the battlefield, note the most prevalent creature type in an opponent's library.
When Favored Enemy enters the battlefield, target creature you control fights up to one target creature you don't control.
Whenever a creature an opponent controls of the noted type dies, put a +1/+1 counter on target creature you control.

10 /10

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Invasion of Muraganda // Primordial Plasm

Battle — Siege // Creature — Ooze (0/0)

(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
When Invasion of Muraganda enters the battlefield, put a +1/+1 counter on target creature you control. Then that creature fights up to one target creature you don't control.

Primordial Plasm

At the beginning of combat on your turn, another target creature gets +2/+2 and loses all abilities until end of turn.

4.8 /10

$0.03

Obuun, Mul Daya Ancestor

Legendary Creature — Elf Spirit (3/3)

At the beginning of combat on your turn, up to one target land you control becomes an X/X Elemental creature with trample and haste until end of turn, where X is Obuun's power. It's still a land.
Landfall — Whenever a land enters the battlefield under your control, put a +1/+1 counter on target creature.

7.3 /10

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Struggle for Skemfar

Sorcery

Put a +1/+1 counter on target creature you control. Then that creature fights up to one target creature you don't control. (Each deals damage equal to its power to the other.)
Foretell (During your turn, you may pay and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

4.7 /10

$0.07

Ancient Animus

Instant

Put a +1/+1 counter on target creature you control if it's legendary. Then it fights target creature an opponent controls. (Each deals damage equal to its power to the other.)

8.6 /10

$0.04

Arbalest Engineers

Creature — Human Artificer (2/2)

When Arbalest Engineers enters the battlefield, choose one —
• Arbalest Engineers deals 1 damage to any target.
• Put a +1/+1 counter on target creature. It gains trample and haste until end of turn.
• Create a tapped Powerstone token. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")

3.4 /10

$0.03

Archdruid's Charm

Instant

Choose one —
• Search your library for a creature or land card and reveal it. Put it onto the battlefield tapped if it's a land card. Otherwise, put it into your hand. Then shuffle.
• Put a +1/+1 counter on target creature you control. It deals damage equal to its power to target creature you don't control.
• Exile target artifact or enchantment.

8.8 /10

$9.34

Bola Slinger

Creature — Cat Soldier (2/2)

Backup 1 (When this creature enters the battlefield, put a +1/+1 counter on target creature. If that's another creature, it gains the following ability until end of turn.)
Whenever this creature attacks, tap target artifact or creature an opponent controls.

4 /10

$0.02

Bow of Nylea

Legendary Enchantment Artifact

Attacking creatures you control have deathtouch.
, : Choose one —
• Put a +1/+1 counter on target creature.
• Bow of Nylea deals 2 damage to target creature with flying.
• You gain 3 life.
• Put up to four target cards from your graveyard on the bottom of your library in any order.

9.4 /10

$2.57

Break Ties

Instant

Choose one —
• Destroy target artifact.
• Destroy target enchantment.
• Exile target card from a graveyard.
Reinforce 1— (, Discard this card: Put a +1/+1 counter on target creature.)

5.9 /10

$0.03

Cathedral Acolyte

Creature — Human Cleric (1/2)

Each creature you control with a counter on it has ward . (Whenever it becomes the target of a spell or ability an opponent controls, counter it unless that player pays .)
: Put a +1/+1 counter on target creature that entered the battlefield this turn.

6 /10

$0.20

Collector's Cage

Artifact

Hideaway 5 (When this artifact enters the battlefield, look at the top five cards of your library, exile one face down, then put the rest on the bottom in a random order.)
, : Put a +1/+1 counter on target creature you control. Then if you control three or more creatures with different powers, you may play the exiled card without paying its mana cost.

1.9 /10

$1.87

Concord with the Kami

Enchantment

At the beginning of your end step, choose one or more —
• Put a +1/+1 counter on target creature with a counter on it.
• Draw a card if you control an enchanted creature.
• Create a 1/1 colorless Spirit creature token if you control an equipped creature.

7.2 /10

$0.13

Everythingamajig

Artifact

, : Move a counter from one permanent onto another. If the second permanent refers to any kind of counter, the moved counter becomes one of those counters. Otherwise, it becomes a +1/+1 counter.
, : Put a +1/+1 counter on target creature.
, : Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

10 /10

$2.06

Fabrication Module

Artifact

Whenever you get one or more (energy counters), put a +1/+1 counter on target creature you control.
, : You get .

6.3 /10

$0.17

Feast on the Fallen

Enchantment

At the beginning of each upkeep, if an opponent lost life last turn, put a +1/+1 counter on target creature you control.

6.7 /10

$0.10

Fight Rigging

Enchantment

Hideaway 5 (When this enchantment enters the battlefield, look at the top five cards of your library, exile one face down, then put the rest on the bottom in a random order.)
At the beginning of combat on your turn, put a +1/+1 counter on target creature you control. Then if you control a creature with power 7 or greater, you may play the exiled card without paying its mana cost.

9 /10

$1.17

Forcemage Advocate

Creature — Centaur Shaman (2/1)

: Return target card from an opponent's graveyard to their hand. Put a +1/+1 counter on target creature.

2.6 /10

$0.20

Gaea's Gift

Instant

Put a +1/+1 counter on target creature you control. It gains reach, trample, hexproof, and indestructible until end of turn. (It can't be the target of spells or abilities your opponents control. Damage and effects that say "destroy" don't destroy it.)

9.5 /10

$0.41

Grafted Growth

Enchantment — Aura

Enchant land
When Grafted Growth enters the battlefield, put a +1/+1 counter on target creature or Vehicle you control.
Enchanted land has ": Add two mana of any one color."

7.2 /10

$0.02

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