Serra's Boon

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Here are cards with similar text to Serra's Boon:

Clutch of Undeath

Enchantment — Aura

Enchant creature
Enchanted creature gets +3/+3 as long as it's a Zombie. Otherwise, it gets -3/-3.

0.7 /10

$0.06

Gift of Fangs

Enchantment — Aura

Enchant creature
Enchanted creature gets +2/+2 as long as it's a Vampire. Otherwise, it gets -2/-2.

5.7 /10

$0.05

Nyx Infusion

Enchantment — Aura

Enchant creature
Enchanted creature gets +2/+2 as long as it's an enchantment. Otherwise, it gets -2/-2.

1.2 /10

$0.02

Phyrexian Boon

Enchantment — Aura

Enchant creature
Enchanted creature gets +2/+1 as long as it's black. Otherwise, it gets -1/-2.

0.9 /10

$0.27

Sea Legs

Enchantment — Aura

Flash
Enchant creature
Enchanted creature gets +0/+2 as long as it's a Pirate. Otherwise, it gets -2/-0.

2.7 /10

$0.04

Tahngarth's Rage

Enchantment — Aura

Enchant creature
Enchanted creature gets +3/+0 as long as it's attacking. Otherwise, it gets -2/-1.

3 /10

$0.27

Clawing Torment

Enchantment — Aura

Enchant artifact or creature
As long as enchanted permanent is a creature, it gets -1/-1 and can't block.
Enchanted permanent has "At the beginning of your upkeep, you lose 1 life."

7.3 /10

$0.04

Precipitous Drop

Enchantment — Aura

Enchant creature
When Precipitous Drop enters the battlefield, venture into the dungeon. (Enter the first room or advance to the next room.)
Enchanted creature gets -2/-2. It gets -5/-5 instead as long as you've completed a dungeon.

5.9 /10

$0.02

Short Circuit

Enchantment — Aura

Flash
Enchant artifact or creature
As long as enchanted permanent is a creature, it gets -3/-0 and loses flying.

3 /10

$0.03

So Tiny

Enchantment — Aura

Flash
Enchant creature
Enchanted creature gets -2/-0. It gets -6/-0 instead as long as its controller has seven or more cards in their graveyard.

2.6 /10

$0.05

Favorable Destiny

Enchantment — Aura

Enchant creature
Enchanted creature gets +1/+2 as long as it's white.
Enchanted creature has shroud as long as its controller controls another creature. (It can't be the target of spells or abilities.)

4.2 /10

$0.26

Ray of Enfeeblement

Instant

Target creature gets -4/-1 until end of turn. If that creature is white, it gets -4/-4 until end of turn instead.

2.7 /10

$0.12

Baneblade Scoundrel // Baneclaw Marauder

Creature — Human Rogue Werewolf // Creature — Werewolf (4/3)

Whenever Baneblade Scoundrel becomes blocked, each creature blocking it gets -1/-1 until end of turn.
Daybound (If a player casts no spells during their own turn, it becomes night next turn.)

Baneclaw Marauder

Whenever Baneclaw Marauder becomes blocked, each creature blocking it gets -1/-1 until end of turn.
Whenever a creature blocking Baneclaw Marauder dies, that creature's controller loses 1 life.
Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)

2.3 /10

$0.04

Briar Patch

Enchantment

Whenever a creature attacks you, it gets -1/-0 until end of turn.

2.9 /10

$0.28

Genestealer Locus

Creature — Tyranid Human (3/3)

Neurotraumal Rod — Whenever a creature attacks you, it gets -1/-0 until end of turn.
Whenever a creature attacks one of your opponents, it gets +0/+1 until end of turn.

4.5 /10

$0.05

Homarid

Creature — Homarid (2/2)

Homarid enters the battlefield with a tide counter on it.
At the beginning of your upkeep, put a tide counter on Homarid.
As long as there is exactly one tide counter on Homarid, it gets -1/-1.
As long as there are exactly three tide counters on Homarid, it gets +1/+1.
Whenever there are four or more tide counters on Homarid, remove all tide counters from it.

1 /10

$0.18

Jace, Architect of Thought

Legendary Planeswalker — Jace

+1: Until your next turn, whenever a creature an opponent controls attacks, it gets -1/-0 until end of turn.
?2: Reveal the top three cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other on the bottom of your library in any order.
?8: For each player, search that player's library for a nonland card and exile it, then that player shuffles. You may cast those cards without paying their mana costs.

8 /10

--

Johtull Wurm

Creature — Wurm (6/6)

Whenever Johtull Wurm becomes blocked, it gets -2/-1 until end of turn for each creature blocking it beyond the first.

0.3 /10

--

Jungle Wurm

Creature — Wurm (5/5)

Whenever Jungle Wurm becomes blocked, it gets -1/-1 until end of turn for each creature blocking it beyond the first.

0.6 /10

--

Lesser Werewolf

Creature — Werewolf (2/4)

: If Lesser Werewolf's power is 1 or more, it gets -1/-0 until end of turn and put a -0/-1 counter on target creature blocking or blocked by Lesser Werewolf. Activate only during the declare blockers step.

0.2 /10

$4.30

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