Swarm of Rats's power is equal to the number of Rats you control.

Enchant creature
Enchanted creature gets +1/+3 and has reach. (It can block creatures with flying.)

Creatures you control get +0/+1.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

When this creature dies, draw a card.

Target creature you control deals damage equal to its power to target creature or planeswalker you don't control.

When this creature dies, draw a card.

(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Jaya's Immolating Inferno deals X damage to each of up to three targets.

Whenever equipped creature attacks alone, it gets +1/+1 until end of turn for each other creature you control.
Equip (: Attach to target creature you control. Equip only as a sorcery.)

When this enchantment enters, exile target creature an opponent controls with mana value 3 or less.
When this enchantment leaves the battlefield, target opponent creates a 3/3 green Dinosaur creature token with trample.

Hexproof, reach

Enchant creature
Enchanted creature has lifelink and "Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature." (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)

Rally — Whenever this creature or another Ally you control enters, creatures you control gain first strike until end of turn.

Volcanic Spite deals 3 damage to target creature, planeswalker, or battle. You may put a card from your hand on the bottom of your library. If you do, draw a card.

Enchant creature
Enchanted creature can't attack or block.

Destroy target nonlegendary creature.

Reveal the top five cards of your library. You may put a creature or enchantment card from among them into your hand. Put the rest into your graveyard.

Create X 1/1 red Elemental Cat creature tokens with haste. Exile them at the beginning of the next end step.
Flashback—, Sacrifice X Mountains. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Add .

: Exile target card from a graveyard. If it was a permanent card, put a +1/+1 counter on this permanent.
Equipped creature gets +1/+1 for each +1/+1 counter on this Equipment.
Reconfigure (: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)

Replicate (When you cast this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)
Target Mountain becomes a 3/1 creature. It's still a land.

: Add .

Whenever a creature you control enters, this enchantment deals 1 damage to each opponent.

: Target creature gets -X/-0 until end of turn, where X is the number of Merfolk and/or Faeries you control.

Destroy target tapped creature.
Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Vigilance (Attacking doesn't cause this creature to tap.)

Enchant creature
Enchanted creature gets +2/+2 and has haste.

At the beginning of your upkeep, sacrifice this creature unless you exile the top creature card of your graveyard.

When this creature enters, create X Treasure tokens, where X is the number of artifacts and enchantments your opponents control. (Treasure tokens are artifacts with ", Sacrifice this token: Add one mana of any color.")

Choose one —
• Destroy target artifact.
• Target creature gets +1/+1 and gains trample until end of turn.
• Remove two time counters from target permanent or suspended card.

Tap up to two target creatures.
Cycling (, Discard this card: Draw a card.)

When this creature enters, each player may discard a card. Each player who discarded a card this way may search their library for a basic land card, reveal it, put it into their hand, then shuffle.

Enchant player
If a card would be put into enchanted player's graveyard from anywhere, instead that card is revealed and put on the bottom of that player's library.

, Put a page counter on this artifact: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)
, , Put a page counter on this artifact: Draw a card.
When there are four or more page counters on this artifact, exile it. If you do, you gain 4 life.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

This creature can't attack unless you control an artifact.

Wither (This deals damage to creatures in the form of -1/-1 counters.)
Whenever this creature deals damage to a player, that player can't gain life for the rest of the game.