: Add .
: Add or . This artifact deals 1 damage to you.

Whenever an artifact you control enters, this creature deals 1 damage to each opponent.

At the beginning of each end step, if an opponent discarded a card this turn, you draw a card and you lose 1 life.
: Each opponent with no cards in hand loses 10 life.

Prevent all combat damage that would be dealt this turn if was spent to cast this spell. Each player loses 1 life for each attacking creature they control if was spent to cast this spell. (Do both if was spent.)

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

, : Double the amount of each type of unspent mana you have.

, Exile this Vehicle and four other artifact creatures and/or Vehicles you control: Create Mechtitan, a legendary 10/10 Construct artifact creature token with flying, vigilance, trample, lifelink, and haste that's all colors. When that token leaves the battlefield, return all cards exiled with this Vehicle except this card to the battlefield tapped under their owners' control.
Crew 2

Whenever a nontoken creature enters, if this artifact is untapped, that creature's controller creates a 1/1 colorless Myr artifact creature token.

As this artifact enters, look at an opponent's hand, then choose any card name.
Activated abilities of sources with the chosen name can't be activated unless they're mana abilities.

, : Target creature you control phases out. (Treat it and anything attached to it as though they don't exist until your next turn.)

Cut deals 4 damage to target creature.

Whenever a Sliver you control attacks, defending player loses 1 life.

As an additional cost to cast this spell, discard a card.
Draw two cards.

Search your library for a card, put that card into your hand, then shuffle.

Whenever a creature you control deals combat damage to a player, choose one —
• Goad target creature that player controls.
• Exile the top card of that player's library. Until end of turn, you may cast that card and you may spend mana as though it were mana of any color to cast that spell.

Protection from blue (This creature can't be blocked, targeted, dealt damage, or enchanted by anything blue.)
Whenever this creature attacks, it gets +2/+0 until end of turn for each other attacking Goblin.

Menace (This creature can't be blocked except by two or more creatures.)
When this creature dies, you may pay . If you do, return it to its owner's hand.
When this creature dies, you may pay . If you do, return another target Zombie creature card with mana value X from your graveyard to the battlefield.

Search your library for a Forest card, put that card onto the battlefield, then shuffle.

: Add .
: Add or . This artifact deals 1 damage to you.

This spell can't be countered.
Destroy target nonland permanent with mana value 3 or less.

If you would flip a coin, instead flip two coins and ignore one.

Sliver creatures you control have ": Add one mana of any color."

Whenever an Aura you control enters, if you cast it, you may search your library for an Aura card with mana value less than or equal to that Aura and with a different name than each Aura you control, put that card onto the battlefield attached to Light-Paws, then shuffle.

Whenever an opponent casts a spell during your turn and when this creature dies, create a green and white Elemental creature token with "This token's power and toughness are each equal to the number of creatures you control."

Return up to X target artifact and/or non-Aura enchantment cards each with mana value X or less from your graveyard to the battlefield. If X is 6 or more, those permanents are 4/4 creatures in addition to their other types.

Proliferate, then choose any number of permanents you control that had a counter put on them this way. Those permanents phase out. (To proliferate, choose any number of permanents and/or players, then give each another counter of each kind already there. Treat phased-out permanents and anything attached to them as though they don't exist until their controller's next turn.)

At the beginning of each player's draw step, that player draws an additional card.

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

Enchant creature card in a graveyard
When this Aura enters, if it's on the battlefield, it loses "enchant creature card in a graveyard" and gains "enchant creature put onto the battlefield with this Aura." Return enchanted creature card to the battlefield under your control and attach this Aura to it. When this Aura leaves the battlefield, that creature's controller sacrifices it.
Enchanted creature gets -1/-0.

You may have this creature enter as a copy of any creature on the battlefield, except it's an Illusion in addition to its other types and it has "When this creature becomes the target of a spell or ability, sacrifice it."

Flash
Whenever an opponent searches their library, you gain 1 life and draw a card.

Lands you control are every basic land type in addition to their other types.

All Slivers have "Pay 2 life: Return this permanent to its owner's hand."

Each player chooses a number of lands they control equal to the number of lands controlled by the player who controls the fewest, then sacrifices the rest. Players discard cards and sacrifice creatures the same way.

Choose a card name, then target player mills a card. If a card with the chosen name was milled this way, you draw two cards. Otherwise, you draw a card.

Whenever a commander you control deals combat damage to an opponent, it deals that much damage to each other opponent.
Partner (You can have two commanders if both have partner.)