As this creature enters, choose a color.
Whenever you cast a spell of the chosen color, you gain 1 life.

Flying
: This creature gets +1/-1 until end of turn.

This creature gets +1/+0 for each other Rat you control.
A deck can have any number of cards named Rat Colony.

Target player sacrifices a creature of their choice.

Create an X/X black and green Spirit Warrior creature token, where X is the greatest toughness among creatures you control.

When this creature enters, look at the top three cards of your library. You may reveal an instant or sorcery card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

, , Sacrifice this artifact: Search your library for up to two basic land cards, reveal them, put them into your hand, then shuffle.

Pierce the Sky deals 7 damage to target creature with flying.

When this creature enters, add .

Kicker (You may pay an additional as you cast this spell.)
Create two 1/1 green Saproling creature tokens. If this spell was kicked, create four of those tokens instead.

Backup 1 (When this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following ability until end of turn.)
This creature assigns combat damage equal to its toughness rather than its power.

Flying
: Add one mana of any color.

Flying
Whenever this creature deals combat damage to a player, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Choose one —
• Destroy target artifact.
• Destroy target enchantment.
• Exile target card from a graveyard.

Tap target creature.
Draw a card.

Flying
Whenever this creature attacks, create a 1/1 white Soldier creature token that's tapped and attacking.

Switch target creature's power and toughness until end of turn.
Draw a card.

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.)
Equip

When this enchantment enters and whenever an opponent loses the game, exile the top card of each player's library.
During each player's turn, that player may play a land or cast a spell from among cards exiled with this enchantment, and they may spend mana as though it were mana of any color to cast that spell. When they do, exile the top card of their library.

As an additional cost to cast this spell, sacrifice a creature.
You gain life equal to the sacrificed creature's toughness. Destroy target creature an opponent controls.

, Sacrifice this enchantment: Target opponent exiles two cards from their hand. Activate only as a sorcery.

, Sacrifice this enchantment: Add .

Whenever you tap a nonland permanent for mana, add one mana of any type that permanent produced.
: Look at the top five cards of your library. You may put a non-Human creature card from among them onto the battlefield. Put the rest on the bottom of your library in a random order.

Hideaway 4 (When this creature enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.)
This creature enters tapped.
When this creature leaves the battlefield, put the exiled card into its owner's hand.

: You may put a land card from your hand onto the battlefield. If you control ten or more lands, flip this creature.

Target creature gets +3/+0 and gains first strike until end of turn. (It deals combat damage before creatures without first strike.)

: This creature gets +3/+3 until end of turn. Activate only once each turn.

When this enchantment enters, exile all graveyards.
If a card or token would be put into a graveyard from anywhere, exile it instead.

Target player sacrifices a creature of their choice and loses 1 life.

When Valki enters, each opponent reveals their hand. For each opponent, exile a creature card they revealed this way until Valki leaves the battlefield.
: Choose a creature card exiled with Valki with mana value X. Valki becomes a copy of that card.

Rolling Thunder deals X damage divided as you choose among any number of targets.

: Mill two cards. (Put the top two cards of your library into your graveyard.)
, Exile this artifact: Shuffle any number of target cards from your graveyard into your library.

Target creature gets +3/+1 and gains trample until end of turn. (It can deal excess combat damage to the player or planeswalker it's attacking.)

This creature gets +1/+1 as long as you control a Swamp.
: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

When this enchantment enters, search your library for a basic land card, reveal it, put it into your hand, then shuffle.
, Sacrifice this enchantment: You gain 2 life and draw two cards. Target opponent loses 2 life. This enchantment deals 2 damage to up to one target creature. You create a 2/2 green Bear creature token.

: This creature gets +2/+2 until end of turn.