How would you rate these custom MTG cards for Modern and Commander?

Goblin Horde RR

Creature - Goblin - Common

You may play with any number of Goblin Horde cards in your Library.

When Goblin Horde enters the Battlefield, search your Library for a copy of Goblin Horde, reveal it, and put it into your hand. Shuffle your Library.

2/2

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Ant Drone G

Creature - Insect - Rare

T: Shuffle Ant Drone into its owner's Library. Draw two cards.

1/1

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Fire Ants RR

Creature - Insect - Rare

When Fire Ants enters the Battlefield, it deals 2 damage to target Creature or Player.

2/2

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Mage Arrow 1R

Instant - Rare

Split-Second.

Mage Arrow deals 3 damage to target Creature or Player. This Spell is considered Colorless instead of Red.

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Metroid 2U

Creature - Metroid - Rare

Flying.

When a creature is damaged by Metroid, tap that creature and it doesn't untap during its controller's next untap step.

1/4

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Atmospheric River 1G

Instant - Rare

Atmospheric River deals 2 damage to each creature with Flying. Then each of those creatures loses Flying until end of turn.

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Timid Elephant GG

Creature - Elephant - Rare

3/3

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Giant Zombie B

Creature - Zombie - Rare

As an additional cost to cast Giant Zombie, pay 3 Life.

3/3

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Feedback UUR

Instant - Mythic

Counter target spell. Feedback deals 3 damage to target Creature.

How would you rate these custom MTG cards for Modern and Commander?
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